參數(shù)資料
型號: AM79C970
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述: PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁數(shù): 42/168頁
文件大?。?/td> 943K
代理商: AM79C970
P R E L I M I N A R Y
AMD
1-909
Am79C970
Slave I/O Transfers
After the PCnet-PCI controller is configured as I/O de-
vice (by setting IOEN in the PCI Command register), it
starts monitoring the PCI bus for access to its internal
registers. The PCnet-PCI controller will look for an ad-
dress that falls within its 32 bytes of I/O address space
(starting from the I/O base address). The PCnet-PCI
controller will assert
DEVSEL
if it detects an address
match and the access is an I/O cycle.
DEVSEL
is as-
serted two clock cycles after the host has asserted
FRAME
. The PCnet-PCI controller will not assert
DEV-
SEL
if it detects an address match, but the PCI com-
mand is not of the type I/O read or I/O write. The
PCnet-PCI controller will suspend looking for I/O cycles
while being a bus master.
Slave I/O Read
The Slave I/O Read command is used by the host CPU
to read the PCnet-PCI’s CSRs, BCRs and EEPROM lo-
cations. It is a single cycle, non-burst 8-bit,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 read
access on the part of the PCnet-PCI controller is 6 to 7
clock cycles, depending upon the relative phases of the
internal Buffer Management Unit clock and the CLK sig-
nal, since the internal Buffer Management Unit clock is a
divide-by-two version of the CLK signal. The PCnet-PCI
controller will not produce Slave I/O Read commands
while being a bus master.
FRAME
CLK
AD
IRDY
TRDY
C/
BE
1
2
3
4
5
6
7
8
ADDR
DATA
0010
BE
's
9
10
11
PAR
PAR
PAR
STOP
DEVSEL
18220C-20
Figure 18.
Slave I/O Read
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參數(shù)描述
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