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Oceniono. / 5. Na podstawie oceny klientów
base + 5 almostempty
The table below outlines the use of the various fields of the
Table 16-4: FIFO Status Field Descriptions
Field Type Description
fill_level RO The instantaneous fill level of the FIFO, provided in units of symbols for
a FIFO with an Avalon-ST FIFO and words for an Avalon-MM FIFO.
i_status RO A 6-bit register that shows the FIFO’s instantaneous status. See Status
Bit Field Description Table for the meaning of each bit field.
event RW1
C
A 6-bit register with exactly the same fields as i_status. When a bit in
the i_status register is set, the same bit in the event register is set. The
bit in the event register is only cleared when software writes a 1 to that
bit.
interrupten-
able
RW A 6-bit interrupt enable register with exactly the same fields as the
event and i_status registers. When a bit in the event register
transitions from a 0 to a 1, and the corresponding bit in interrupten-
able is set, the master Is interrupted.
almostfull RW A threshold level used for interrupts and status. Can be written by the
Avalon-MM status master at any time. The default threshold value for
DCFIFO is Depth-4. The default threshold value for SCFIFO is Depth-1.
The valid range of the threshold value is from 1 to the default. 1 is used
when attempting to write a value smaller than 1. The default is used
when attempting to write a value larger than the default.
almostempty RW A threshold level used for interrupts and status. Can be written by the
Avalon-MM status master at any time. The default threshold value for
DCFIFO is 1. The default threshold value for SCFIFO is 1. The valid
range of the threshold value is from 1 to the maximum allowable
almostfull threshold. 1 is used when attempting to write a value
smaller than 1. The maximum allowable is used when attempting to
write a value larger than the maximum allowable.
status register.
Table 16-5: Status Bit Field Descriptions
Bit(s) Name Description
0 FULL Has a value of 1 if the FIFO is currently full.
1 EMPTY Has a value of 1 if the FIFO is currently empty.
2 ALMOSTFULL Has a value of 1 if the fill level of the FIFO is greater than the almostfull
value.
3 ALMOSTEMPTY Has a value of 1 if the fill level of the FIFO is less than the almostempty
value.
4 OVERFLOW Is set to 1 for 1 cycle every time the FIFO overflows. The FIFO overflows
when an Avalon write master writes to a full FIFO. OVERFLOW is only
valid when Allow backpressure is off.
UG-01085
2014.24.07
Software Control
16-9
On-Chip FIFO Memory Core
Altera Corporation
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- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Contents 2
- Altera Corporation 10
- Introduction 14
- Device Support 15
- December 16
- Initial release. — 16
- SDRAM Controller Core 17
- Avalon-MM Interface 18
- Off-Chip SDRAM Interface 18
- Memory Profile Page 21
- Timing Page 22
- SDRAM Memory Model 23
- Symptoms of an Untuned PLL 26
- Example Calculation 27
- Parameter Symbol 28
- Value (ns) in -7 Speed Grade 28
- Min. Max 28
- Parameter Symbol Value (ns) 28
- Tri-State SDRAM 31
- Configuration Parameter 32
- Interface 33
- Reset and Clock Requirements 38
- Architecture 38
- Block Level Usage Model 39
- Compact Flash Core 41
- Required Connections 42
- (32-bit Word Address) 54
- Register Name R/W 54
- Bit Description 54
- JTAG UART Core 58
- Read and Write FIFOs 59
- JTAG Interface 59
- Host-Target Connection 59
- Simulation Settings 61
- UART Core 70
- RS-232 Interface 71
- Transmitter Logic 71
- Instantiating the Core 72
- Data Bits, Stop Bits, Parity 73
- Synchronizer Stages 74
- Flow Control 74
- Streaming Data (DMA) Control 74
- Request Description 79
- Bit Name Access Description 81
- May 2008 86
- 16550 UART 87
- Unsupported Features 88
- General Architecture 90
- Configuration Parameters 90
- DMA Support 91
- FPGA Resource Usage 91
- Timing and Fmax 92
- Avalon-MM Slave 93
- Overrun/Underrun Conditions 94
- Hardware Auto Flow-Control 95
- 16550 UART API 98
- Private APIs 99
- UART Device Structure 100
- Figure 9-7: 101
- Driver Examples 102
- UG-01085 103
- 2014.24.07 103
- Document Revision History 106
- SPI Core 107
- txdata 108
- Receiver Logic 109
- Master and Slave Modes 109
- Slave Mode Operation 110
- Multi-Slave Environments 110
- Configuration 111
- Data Register Settings 112
- Timing Settings 112
- Software Programming Model 113
- Software Files 114
- Register Map 115
- # Name Description 116
- Date and 118
- Document 118
- Core Overview 119
- Functional Description 119
- Interrupt Behavior 121
- PIO Core 123
- Data Input and Output 124
- Edge Capture 124
- IRQ Generation 124
- Example Configurations 125
- Input Options 126
- Operation 132
- PCI Lite Core 135
- Avalon-MM Ports 137
- Prefetchable Avalon-MM Master 137
- I/O Avalon-MM Master 138
- PCI Bus Access Slave 138
- Master and Target Performance 139
- Space Indicator 141
- (Bits 1:0) 141
- Description 141
- Avalon-to-PCI Write Request 142
- Ordering of Requests 143
- Send Feedback 145
- PCI Timing Constraint Files 146
- Simulation Considerations 147
- Simulation Flow 149
- MDIO Core 151
- MDIO Frame Format (Clause 45) 152
- MDIO Clock Generation 153
- Interfaces 153
- Parameter 154
- Configuration Registers 154
- On-Chip FIFO Memory Core 156
- Offset Bits Field Description 158
- FIFO Settings 161
- Interface Parameters 161
- Software Control 163
- Field Type Description 164
- Bit(s) Name Description 164
- Software Example 166
- On-Chip FIFO Memory API 167
- Multi-Channel Shared FIFO 176
- Parameters 177
- Address Width 178
- Name Access Reset 180
- Bytes Converter Cores 185
- Feature Property 186
- Transaction 190
- DMA Descriptors 197
- Error Conditions 198
- Signal Type Description 199
- Timeouts 206
- Data Structure 207
- SG-DMA API 208
- Name Description 209
- Overview 217
- Feature Description 217
- Component Interface 220
- Descriptor Slave Port 221
- Component GUI 222
- Byte Lanes 223
- Read and Write Address Fields 224
- Length Field 224
- Sequence Number Field 225
- Read and Write Stride Fields 225
- Control Field 225
- Bit Sub-Field Name Definition 226
- Register Map of mSGDMA 228
- Status Register 229
- Control Register 229
- Bit Name Description 230
- Offset Access 3 2 1 0 230
- Unsupported Feature 231
- DMA Controller Core 232
- Setting Up DMA Transactions 233
- Advanced Options 235
- Video Sync Generator 242
- Parameter Name Description 244
- Horizontal sync pulse 245
- Horizontal front porch 245
- Horizontal blank pixels 245
- Pixel Converter 246
- Interval Timer Core 249
- Counter Size 251
- Hardware Options 251
- Bit Name R/W/C Description 255
- Mutex Core 258
- Mutex API 260
- Mailbox Core 264
- Mailbox API 267
- Functional Blocks 273
- Register Maps 275
- Run-time Initialization 285
- Board Support Package 285
- VIC IRQ RRS RIL 291
- November 293
- Altera FPGA 294
- Core Behavior 295
- System ID Core 298
- Performance Counter Core 301
- Global Counter 302
- Using the Performance Counter 304
- Name (1) Meaning 305
- Performance Counter API 306
- PERF_START_MEASURING() 307
- PERF_STOP_MEASURING() 307
- PERF_BEGIN() 307
- PERF_END() 308
- PLL Cores 312
- Registers 313
- PLL Core 313
- ALTPLL Megafunction 313
- Instantiating the PLL Core 314
- Altera MSI to GIC Generator 320
- Interrupt Servicing Process 321
- Registers of Component 322
- Altera SMBus Core Interface 324
- Component Parameterization 326
- Frequency Register 331
- 32-bit Counter 332
- Software Access 334
- Implementation Details 335
- IP Caveats 336
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