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): 24/168頁
文件大?。?/td> 943K
代理商: AM79C970
P R E L I M I N A R Y
AMD
1-891
Am79C970
Basic Burst Read Cycles
The PCnet-PCI controller provides a burst mode to read
data from the transmit buffer. The burst mode must be
enabled by setting BREADE in BCR18. All PCnet-PCI
controller burst read transfers are of the PCI command
type Memory Read Line (type15). AD[1:0] will both be
ZERO during the address phase indicating a linear burst
order. All four byte enable signals will be ZERO during
the data phase as the PCnet-PCI controller always
reads a full 32-bit word when in burst mode.
Figure 4 shows a typical burst read access. The PCnet-
PCI 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 de-
termined by the timing of
TRDY
.
18220C-6
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
ADDR
0000
1110
11
10
9
12
PAR
PAR
DATA
DATA
DATA
DATA
PAR
PAR
PAR
PAR
DEVSEL
is sampled by the PCnet-PCI controller.
13
Figure 4. Burst Read Cycles
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
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AM79C970AKC\\W 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述:
AM79C970AKC\W 制造商:Rochester Electronics LLC 功能描述:- Bulk