參數(shù)資料
型號: AM79C972BKCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
中文描述: 5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16
封裝: PLASTIC, QFP-160
文件頁數(shù): 75/130頁
文件大?。?/td> 1580K
代理商: AM79C972BKCW
Am79C972
75
adding the input to clock setup time for Flash/EPRO in-
puts (t
s_D
) from the time defined by ROMTMG:
t
ACC
= ROMTMG * CLK period * CLK_FAC - (t
v_A_D
) -
(t
s_D
)
The timing diagram in Figure 42 assumes the default
programming of ROMTMG (1001b = 9 CLK). After
reading the first byte, the Am79C972 controller reads in
three more bytes by incrementing the lower portion of
the ROM address. After the last byte is strobed in,
TRDY will be asserted on clock 50. When the host tries
to perform a burst read of the Expansion ROM, the
Am79C972 controller will disconnect the access at the
second data phase.
The host must program the Expansion ROM Base Ad-
dress register in the PCI configuration space before the
first access to the Expansion ROM. The Am79C972
controller will not react to any access to the Expansion
ROM until both MEMEN (PCI Command register, bit 1)
and ROMEN (PCI Expansion ROM Base Address reg-
ister, bit 0) are set to 1. After the Expansion ROM is
enabled, the Am79C972 controller will claim all memory
read accesses with an address between ROMBASE
and ROMBASE + 1M - 4 (ROMBASE, PCI Expansion
ROM Base Address register, bits 31-20). The address
output to the Expansion ROM is the offset from the ad-
dress on the PCI bus to ROMBASE. The Am79C972
controller aliases all accesses to the Expansion ROM
of the command types
Memory Read Multiple
and
Mem-
ory Read Line
to the basic Memory Read command.
Figure 40.
EPROM Only Configuration for the Expansion Bus (64K EPROM)
EBUA_EBA[7:0]
EBDA[15:8]
EBD[7:0]
EBWE
EROMCS
A[15:8]
A[7:0]
DQ[7:0]
CS
OE
Am79C972
EPROM
AS_EBOE
21485C-43
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