W6694 Datasheet, PDF (23/33 Pages) Winbond – USB Bus ISDN S/T-Controller

Preliminary W6694
TLP Test Loopback
When set this bit both the GCIDU and GCIDD lines are internally connected together. The
GCI mode loopback test function: GCIDU is internally connected with GCIDD, external input
on GCIDD is ignored.
GRLP GCI Mode Remote Loopback
Setting this bit to 1 activates the remote loopback function. The 2B+D channels data received
from the GCI bus interface are looped to the transmitted channels.
SPU Software Power Up
PD Power Down
SPU PD
DESCRIPTION
0
1 After U transceiver power down, W6694 will receive the indication DC
(Deactivation Confirmation) from GCI bus and then software has to set SPU → 0,
PD →1 to acknowledge U transceiver, by pulling GCIDU line to HIGH. W6694
remains normal operation.
1
0 Setting SPU → 1, PD →0 will pull the GCI bus GCIDU line to LOW. This will
enforce connected layer 1 devices (U transceiver) to deliver GCI bus clocking.
0
0 After reception of the indication PU (Power Up indication) the reaction of the
microprocessor should be:
- To write an AR (Activate Request command) as C/I command code in the CIX
register.
- To reset the SPU bit and wait for the following ICC (indication code change)
interrupt.
1
1 Unused.
GE GCI Mode Enable
Setting this bit to 1 will enable the GCI bus interface. In the same time, the S/T layer 1
function is disabled.
8.3.2 Monitor Channel Control Register
Value after reset: 00h
7
6
5
0
0
0
4
3
0
MRIE
MOCR Read/Write Address 07h
2
MRC
1
MXIE
0
MXC
MRIE Monitor Channel 0 Receive Interrupt Enable
Monitor channel interrupt status MDR, MER generation is enabled (1) or masked (0).
MRC MR Bit Control
Determines the value of the MR bit:
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Publication Release Date: October 2000
Revision A1