am79c970 Advanced Micro Devices, am79c970 Datasheet - Page 43

• Manufacturer Part Number: am79c970
• Description: Pcnettm-pci Single-chip Ethernet Controller For Pci Local Bus
• Manufacturer: Advanced Micro Devices

Slave I/O Write
The Slave I/O Write command is used by the host CPU
to write to the PCnet-PCI’s CSRs, BCRs and EEPROM
locations. It is a single cycle, non-burst 16-bit or 32-bit
transfer which is initiated by the host CPU. The typical
number of wait states added to a slave I/O write access
on the part of the PCnet-PCI controller is 6 to 7 clock
1-910
AMD
DEVSEL
FRAME
TRDY
STOP
IRDY
C/BE
CLK
PAR
AD
1
ADDR
0011
2
PAR
BE's
3
DATA
Figure 19. Slave I/O Write
4
PAR
P R E L I M I N A R Y
Am79C970
5
cycles, depending upon the relative phases of the inter-
nal Buffer Management Unit clock and the CLK signal,
since the internal Buffer Management Unit clock is a di-
vide-by-two version of the CLK signal. The PCnet-PCI
controller will not produce Slave I/O write commands
while being a bus master.
6
7
8
9
10
11
18220C-21