Altera Embedded Peripherals IP Instrukcja Użytkownika Strona 158

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per symbol, symbols per beat, and the width of the channel and error signals. The FIFO core performs
the endian conversion to conform to the output interface protocol.
The signals that comprise the output interface are mapped into bits in the Avalon address space. If Allow
backpressure is turned on, the input interface asserts waitrequest to indicate that the FIFO core does
not have enough space for the transaction to complete.
Figure 16-3: FIFO with Avalon-MM Input Interface and Avalon-ST Output Interface
On-Chip FIFO
Memory
S S
S
SRC
Input Statu s I/F
(optional)
Output Status I/F
(optional)
system interconne ct fabric
Input Data
Strea ming
Output Data
SRC
Avalon-ST Source
S
Avalon-MM Slave Port
Offset 31 24 23 19 18 16 15 13 12 8 7 4 3 2 1 0
base +
0
Symbol 3 Symbol 2 Symbol 1 Symbol 0
base +
1
reserved reserved error reserve
d
channel reserved empt
y
E
O
P
S
O
P
Table 16-1: Memory Map
Offset Bits Field Description
0 31:0 SYMBOL_0,
SYMBOL_1,
SYMBOL_
2 ..
SYMBOL_n
Packet data. The value of the Symbols per beat
parameter specifies the number of fields in this
register; Bits per symbol specifies the width of
each field.
UG-01085
2014.24.07
Avalon-MM Write Slave to Avalon-ST Source
16-3
On-Chip FIFO Memory Core
Altera Corporation
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