IBM3009K2672
IBM SONET/SDH Framer
Clock Monitor Status and Mask Registers
The clock monitor status register bits indicate the loss of a specific island’s clock. They are set whenever a
difference between the clock test signal and the individual island’s clock acknowledge signal occurs after the
clock monitor test period. ClkStat1 consists of pointer bits that indicate active clock status errors in
ClkStat2/3/4.
For each bit position: 0: Normal operation of the corresponding clock island
1: The corresponding island clock is lost
An active bit of these registers is reset by restoring the clock of the corresponding clock island and by writing
a ‘1’ into the corresponding bit position. Reading one register will reset all bits of this register if the “clear-reg-
ister” option is set in bit ConfGP1(3).
The clock monitor mask registers ClkMask2/3/4 control the propagation of active clock monitor status signals
to bits 7/6/5 of ClkStat1. ClkMask1 controls propagation to the signal FElocCS (bit 1 of IRQGP1 register). The
mask registers allow read and write access.
For each bit position: 0: The corresponding clock status bit is masked (DEFAULT)
1: The corresponding clock status bit is active (for ClkMask1, the corresponding bit
activates the signal FElocCS (bit 1 of IRQGP1 register))
4.1: ClkStat1, ClkMask1 [3830 H Status, 3838 H Mask]
Signal Name
Reserved
ClkStat4
Bits
4:0
5
Access
R/W
Default
Description
00000
Reserved (pointers)
R/W
0
0
0
Pending active clock status error indication in ClkStat4 register
Pending active clock status error indication in ClkStat3 register
Pending active clock status error indication in ClkStat2 register
ClkStat3
6
R/W
ClkStat2
7
R/W
4.2: ClkStat2, ClkMask2 [3831 H Status, 3839 H Mask]
Signal Name
Bits
Access
Default
Description
PH_Tx4
PH_Tx3
PH_Tx2
PH_Tx1
ACI_Rx2
ACI_Rx1
ACI_Tx2
ACI_Tx1
0
1
2
3
4
5
6
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Clock island PH_Tx4 lost clock
Clock island PH_Tx3 lost clock
Clock island PH_Tx2 lost clock
Clock island PH_Tx1 lost clock
Clock island ACI_Rx2 lost clock
Clock island ACI_Rx1 lost clock
Clock island ACI_Tx2 lost clock
Clock island ACI_Tx1 lost clock
Register Descriptions
Page 124 of 279
ssframer.01
8/27/99
IBM [ IBM ]
