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AM79C974 bảng dữ liệu(PDF) 35 Page - Advanced Micro Devices

tên linh kiện AM79C974
Giải thích chi tiết về linh kiện  PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
PDF  153 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C974 bảng dữ liệu(HTML) 35 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
35
Am79C974
Basic Burst Read Cycles
All Am79C974 controller burst read transfers are of the
PCI command type Memory Read Line (type14).
AD[1:0] will both be ZERO during the address phase in-
dicating a linear burst order. All four byte enable signals
will be ZERO during the data phase as the Am79C974
controller always reads a full 32-bit word when in burst
mode.
Figure 9 shows a typical burst read access. The
Am79C974 controller arbitrates for the bus, is granted
access, and reads four 32-bit words (DWORD) from
system memory and then releases the bus. All four data
phases in this example take two clock cycles each,
which is determined by the timing of
TRDY.
18681A-13
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
12345678
ADDR
0000
1110
11
10
9
12
PAR
PAR
DATA
DATA
DATA
DATA
PAR
PAR
PAR
PAR
DEVSEL is sampled by the Am79C974 controller.
13
Figure 9. Burst Read Cycles



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