參數(shù)資料
型號(hào): CDK8920A
廠商: Cirrus Logic, Inc.
英文描述: CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER
中文描述: 水晶藍(lán)的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 50/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
4.5
Description
Status and Control Register Detailed
Register 0: Interrupt Status Queue (ISQ, Read-only)
Address: PacketPage base + 0120h
F-6
5-0
RegContent
RegNum
The Interrupt Status Queue Register is used in both Memory Mode and I/O Mode to provide the host with
interrupt information. Whenever an event occurs that triggers an enabled interrupt, the CS8920A sets the appro-
priate bit(s) in one of five registers, maps the contents of that register to the ISQ register, and drives an IRQ pin
high. Three of the registers mapped to ISQ are event registers: RxEvent (Register 4), TxEvent (Register 8), and
BusEvent (Register C). The other two registers are counter-overflow reports: RxMISS (Register 10) and TxCOL
(Register 12). In Memory Mode, ISQ is located at PacketPage base + 120h. In I/O Mode, ISQ is located at I/O
Base + 0008h. See Section 5.1. A read of ISQ 0000 indicates that there are no pending interrupts.
BIT
NAME
DESCRIPTION
5-0
RegNum
The lower six bits describe which register (4, 8, C, 10 or 12) is contained in the ISQ.
6
RegContent
The upper ten bits contain the register data contents.
This register’s initial state after reset is:
0000 0000
0000 0000
CS8920A
50
DS238PP2
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