参数资料
型号: SCD223110QCD
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 256K bps, SERIAL COMM CONTROLLER, PQFP100
封装: METRIC, QFP-100
文件页数: 31/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
126
Datasheet
Note:
Bit 7 of the register is always read back as ‘0’. When each of the three Priority Interrupt Level
registers is programmed with the same value, they are internally prioritized, with receive as the
highest priority, followed by transmit and modem.
8.5.2.2
Receive Interrupt Register (RIR)
Bit 7
Ren
Receive enable is set by the CD2231 to initiate a receive interrupt request sequence.
It is cleared during a valid receive interrupt acknowledge cycle.
Bit 6
Ract
Receive active is set automatically when Ren is set, and the Fair Share logic allows
the assertion of a receive interrupt request. It is cleared when the host CPU writes to
the Receive End of Interrupt register.
Bit 5
Reoi
Receive end of interrupt is set automatically when the host CPU writes to the
Receive End of Interrupt register while in a receive interrupt routine.
Bit 4
Reserved – always returns ‘0’ when read.
Bits 3:2
Rvct [1:0]
Receive vector bits are set by the CD2231 to provide the lower two bits of the vector
supplied to the host CPU during an interrupt acknowledge cycle. Receive good data
vector is decoded as follows: Rvct [1] = 1, and Rvct [0] = 1. Receive exception vec-
tor is decoded as follows: Rvct [1] = 0, and Rvct [0] = 0.
Bit 1
Reserved – always returns ‘0’ when read.
Bit 0
Rcn [0]
Receive channel number is set by the CD2231 to indicate the channel requiring
receive interrupt service.
Register Name: RIR
Register Description: Receive Interrupt
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’EF
Motorola Hex Address: x’ED
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Ren
Ract
Reoi
0
Rvct [1]
Rvct [0]
0
Rcn [0]
Ren
Ract
Reoi
Sequence of Events
00
0
Idle
10
0
Receive interrupt requested, but not
asserted
1
0
Receive interrupt asserted
0
1
0
Receive interrupt acknowledged
0
1
Receive interrupt service routine completed
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