am79c970 Advanced Micro Devices, am79c970 Datasheet - Page 44

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

Slave Configuration Transfers
The host can access the PCnet-PCI PCI configuration
space with a configuration read or write command. The
PCnet-PCI controller will assert DEVSEL if the IDSEL
input is asserted during the address phase and if the ac-
cess is a configuration cycle. DEVSEL is asserted two
clock cycles after the host has asserted FRAME. All
configuration cycles are of fixed length. The PCnet-PCI
controller will assert TRDY on the 3rd clock of the
data phase.
DEVSEL
FRAME
IDSEL
TRDY
STOP
IRDY
C/BE
PAR
CLK
AD
Figure 20. Slave Configuration Read
1
ADDR
1010
P R E L I M I N A R Y
2
Am79C970
PAR
BE's
3
Slave Configuration Read
The Slave Configuration Read command is used by the
host CPU to read the configuration space in the PCnet-
PCI controller. This provides the host CPU with informa-
tion concerning the device and its capabilities. This is a
single cycle, non-burst 8-bit, 16-bit, or 32-bit transfer.
4
DATA
5
PAR
6
18220C-22
AMD
1-911