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: 111/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
38
Datasheet
5.2.3
Groups and Types
There are two general reasons for the CD2231 to request service from the host processor — data
transfer and exceptional conditions. Furthermore, interrupts are grouped into three categories, each
with an associated Interrupt Request signal — IREQ1*, IREQ2*, and IREQ3*.
Group 1 — Modem signal change/timer events
Group 2 — Transmit interrupts
Group 3 — Receive interrupts
Group 1 is only used for exceptions. Groups 2 and 3 include both data transfer and exceptions.
Table 2 shows the possible causes of transmit and receive interrupt service requests. The cause of
an interrupt request is encoded into the two least-significant bits of the vector presented on the data
bus during the interrupt acknowledge cycle. The most-significant six bits of the vector come from
the LIVR:
Interrupt Vector LSBs
00
Receive exception
01
Modem signal change or timer event
10
Transmit data or exception
11
Receive Good Data
Figure 4. Interrupt Acknowledge Cycle
IREQn*
IACKIN*
DS*
R/W*, CS*
A/D[0–15]
A[0–7]
DTACK*
DEN*
DATDIR*
VECTOR1
1-CLOCK DELAY
CD2231
SAMPLES ADDRESS BUS
1 Interrupt vector is always on A/D[0–7].
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