am79c974 Advanced Micro Devices, am79c974 Datasheet - Page 30

• Manufacturer Part Number: am79c974
• Description: Pcnettm-scsi Combination Ethernet And Scsi Controller For Pci Systems
• Manufacturer: Advanced Micro Devices

Slave I/O Write
The Slave I/O Write command is used by the host CPU
to write to the Am79C974’s CSRs, BCRs and EEPROM
locations and SCSI and CCB registers. It is a single cy-
cle, non-burst 8-bit, 16–bit, or 32-bit transfer which is
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AMD
DEVSEL
FRAME
TRDY
STOP
IRDY
C/BE
PAR
CLK
AD
1
ADDR
0011
2
PAR
BE's
3
DATA
4
Figure 4. Slave I/O Write
PAR
P R E L I M I N A R Y
Am79C974
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initiated by the host CPU. The typical number of wait
states added to a slave I/O write access on the part of
the Am79C974 controller is 6 to 7 clock cycles. The
Am79C974 controller will not produce Slave I/O write
commands while being a bus master.
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7
8
9
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