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參數資料
| 型號： | W6690 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | ISDN S/T Interface Controller(ISDN S/T接口控制器) |
| 中文描述： | 綜合業務數字網的S / T接口控制器（綜合業務數字網S / T的接口控制器） |
| 文件頁數： | 55/76頁 |
| 文件大?。?/td> | 471K |
| 代理商： | W6690 |
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Preliminary W6690
Publication Release Date: March 1998
- 55 -
Revision A1
8.2.6 B1_ch Extended Interrupt Mask Register B1_EXIM Read/Write Address 25H
Value after reset: FFH
7
6
5
4
3
2
1
0
RMR
RME
RDOV
XFR
XDUN
Setting the bit to "1" masks the corresponding interrupt source in B1_EXIR register. Masked interrupt
status bits are read as zero when B1_EXIR register is read. They are internally stored and pending
until the mask bits are zero.
All the interrupts in B1_EXIR will be masked if the IMASK: B1_EXI bit is set to "1".
8.2.7 B1_ch Status Register
B1_STAR
Read
Address 26H
Value after reset: 20H
7
6
5
4
3
2
1
0
RDOV
CRCE
RMB
XDOW
XBZ
RDOV Receive Data Overflow
A "1" indicates that the D_RFIFO is overflow. The incoming data will overwrite data in the receive
FIFO. The overflow condition will set both the status and interrupt bits. It is recommended that
software must read the RDOV bit after reading data from D_RFIFO at RMR or RME interrupt. The
software must abort the data and issue a RRST command to reset the receiver if RDOV = 1.
CRCE CRC Error
Used in transparent mode only. This bit indicates the result of frame CRC check:
0: CRC correct
1: CRC incorrect
RMB Receive Message Aborted
Used in transparent mode only. A "1" means that a sequence of seven 1's was received and the
frame is aborted by the B1_HDLC receiver. Software must issue RRST command to reset the
receiver.
Note: Bits CRCE and RMB are valid only after a RME interrupt and remain valid until the frame is acknowledged via RACK
command
XDOW Transmit Data Overwritten
At least one byte of data has been overwritten in the B1_XFIFO. This bit is cleared only by XRST
command.
XBZ Transmitter Busy
The B1_HDLC transmitter is busy when XBZ is read as "1". This bit may be polled. The XBZ bit is
active when an XMS command is issued and the message has not been completely transmitted.
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