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參數(shù)資料
| 型號(hào)： | AM79C972BVIW |
| 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, PQFP176 |
| 封裝： | TQFP-176 |
| 文件頁(yè)數(shù)： | 77/130頁(yè) |
| 文件大小： | 1580K |
| 代理商： | AM79C972BVIW |
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Am79C972
77
Figure 42.
Expansion ROM Bus Read Sequence
Figure 43.
Flash Read from Expansion Bus Data Port
The EROMCS is driven low for the value ROMTMG +
1. Figure 43 assumes that ROMTMG is set to nine.
EBD[7:0] is sampled with the next rising edge of CLK
ten clock cycles after EBUA_EBA[7:0] was driven with
a new address value. This PCI slave access to the
Flash/EPROM will result in a retry for the very first ac-
cess. Subsequent accesses may give a retry or not, de-
pending on whether or not the data is present and valid.
The access time is dependent on the ROMTMG bits
(BCR18, bits 15-12) and the Flash/EPROM. This ac-
cess mechanism differs from the Expansion ROM ac-
cess mechanism since only one byte is read in this
manner, instead of the 4 bytes in an Expansion ROM
access. The PCI bus will not be held during accesses
through the Expansion Bus Data Port. If the LAAINC
(BCR29, bit 15) is set, the EBADDRL address will be
incremented and a continuous series of reads from the
Expansion Data Port (EBDATA, BCR30) is possible.
The address incrementor will roll over without warning
and without incrementing the upper address EBAD-
DRU.
The Flash write is almost the same procedure as the
read access, except that the Am79C972 controller will
not drive AS_EBOE low. The EROMCS and EBWE are
driven low for the value ROMTMG again. The write to
the FLASH port is a posted write and will not result in a
retry to the PCI unless the host tries to write a new
value before the previous write is complete, then the
host will experience a retry. See Figure 44.
CLK
EBUA_EBA [7:0]
Latched Address
EBDA [15:8]
EBD
AS_EBO
EROMCS
FRAME
IRDY
TRDY
DEVSEL
5
10
15
20
25
30
35
40
45
50
55
60
66
A[7:2], 0, 1
A[7:2], 0, 0
A[19:16]
A[7:2], 1, 0
A[7:2], 1, 1
21485C-45
21485C-46
EBUA_EBA[7:0]
EBD[7:0]
AS_EBOE
EROMCS
EBUA[19:16]
EBDA[15:8]
EBDA[15:8]
EBA[7:0]
CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
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