w89c940 Winbond Electronics Corp America, w89c940 Datasheet - Page 25

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w89c940

Manufacturer Part Number
w89c940
Description
Elanc-pci Twisted-pair Ether-lan Controller With Pci Interface
Manufacturer
Winbond Electronics Corp America
Datasheet

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This section will introduce the Read Transaction, Write Transaction, and Termination Transaction of PCI bus.
The timing of read transaction is shown in figure.
CLDA0[7:0]
CLDA1[7:0]
EIR_THD
[15:0]
a. Set EIR_EN=1 to enable Eraly Interrupt Function and set EIR_MASK=1 to enable interrupt pin
b. Program eraly interrupt threshold, EIR_THD.
c. Set DCR not in Loopback mode.
d. Set RCR not in monitor mode.
e. Program CR to start receive packet.
f. Wait until a frame with a correct destination address and receive byte count greater than Early
g. An intrrupt initiated and EIR_STATUS register set.
ps: a, b, c, d & e can also be programmed individually.
INTA# of PCI local bus.
interrupt Threshold.
Base+01h[7:0]
Base+02h[7:0]
Base+06h
Page 3
Page 0
[15:0]
Early Interrupt Threshold Register: Word Read/Write
Early Interrupt Threshold is in the unit of byte. The minimum
value of threshold is 64 bytes. Any value less than 64 bytes will
be treated as 64 bytes except value 0000h. Not to program
threshold or program 0000h will be disable Early Interrupt
function. The initial threshold value after Power-on Reset is
0000h.
Current Local DMA Address Register: Read only.
Currrent Address of Local DMA. Use word IO read command to
access the content. Initial value after Power-on Reset is 0000h.
Using word command to read port base+01h will have both
CLDA0 & CLDA1.
25
W89C940

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