
Signal Width Direction Description
write 1 Input Avalon-MM write
control
writedata 32 Input Avalon-MM write data
bus
readdata 32 Output Avalon-MM read data
bus
Table 33-7: Serial Interface
Signal Width Direction Description
smb_clk_oe 1 Output Outgoing SMBus clock.
Output enable for open
drain buffer that drives
SMBCLK pin. When 1,
SMBCLK line is expected
to be pulled low. When 0,
open drain buffer is tri-
stated and SMBCLK line is
externally pulled high.
smb_data_oe 1 Output Outgoing SMBus data.
Output enable for open
drain buffer that drives
SMBDAT pin. When 1,
SMBDAT line is expected
to be pulled low. When 0,
open drain buffer is tri-
stated and SMBDAT line is
externally pulled high.
smb_clk_in 1 Input Incoming SMBus clock,
from the input path of
the SMBCLK open drain
buffer.
smb_data_in 1 Input Incoming SMBus data,
from the input path of
the SMBDAT open drain
buffer.
Table 33-8: Interrupt
Signal Width Direction Description
smb_intr 1 Output Interrupt output to host
processor, active high.
33-6
Altera SMBus Core Interface
UG-01085
2014.24.07
Altera Corporation
Altera MSI to GIC Generator
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