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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： | 42/76頁 |
| 文件大小： | 471K |
| 代理商： | W6690 |
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Preliminary W6690
- 42 -
MDS = 1 is used for internal test purpose only.
RACT Receiver Active
Setting this bit activates the D_ch HDLC receiver. This bit can be read. The receiver must be in
active state in order to receive data.
TMS Timer Mode Setting
Sets the operating mode of the D_ch timer. In the external mode (TMS = 0), the timer is controlled by
the processor. It is started by setting the STT bit in D_CMDR and is stopped by a write of the
D_TIMR register. When the timer expires, a D_EXP interrupt is generated.
In the internal mode (TMS = 1), the timer is used for internal test purposes. It should not be selected
for normal chip operation.
TEE Terminal Equipment Function Enable
The terminal equipment function is enabled when this bit is "1". The supported functions are:
Watchdog timer, enabled when TEE = 1 and D_CTL: TPS = 1
Exchange awake, enabled when TEE = 1 and D_CTL: TPS = 0
When the watchdog timer has been enabled, the micro-processor has to program the WTT1, 2 bits in
a specified manner within 1024 mS to reset and restart the timer. Otherwise, the timer will expire in
1024 mS and a WEXP interrupt together with a 125
μ
S reset pulse on TRST pin is generated.
The exchange awake condition is initiated by C/I code change condition. A 16 mS reset pulse on
TRST pin is generated.
Switching TPS bit will reset the watchdog timer.
The TEE bit is cleared only by a hardware reset.
MFD Multiframe Disable
This bit is used to enable or disable the multiframe structure on S/T interface :
0: Multiframe is enabled
1: Multiframe is disabled
DLP Digital Loopback
Setting this bit activates the digital loopback function. The transmitted digital 2B+D channels are
looped to the received 2B+D channels. Note that after hardware reset, the internal clocks will turn off
if the S bus is not connected or if there is no signal on the S bus. In this case, the C/I command ECK
must be issued to enable loopback function.
RLP Remote Loopback
Setting this bit to "1" activates the remote loopback function. The received 2B channels from the S
interface are looped to the transmitted 2B channels of S interface. The D channel is not looped in
this loopback function.
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