MT90500 Mitel Semiconductor, MT90500 Datasheet - Page 107

• Manufacturer Part Number: MT90500
• Description: Multi-Channel ATM AAL1 SAR
• Manufacturer: Mitel Semiconductor

Address: 6090 (Hex)
Label: MCGCR
Reset Value: 00C0 (Hex)
Refer to Figure 3, “TDM Clock Selection and Generation Logic,” on page 29 for more detailed information regarding the implementation of the
selection bits.
Address: 6092 (Hex)
Label: MCDF
Reset Value: 2000 (Hex)
Address: 60A0 (Hex)
Label: TRPCR
Reset Value: 0001 (Hex)
Seq_CRC_Ena
FREERUN
Cell / 8 kHz
Reserved
Reserved
Reserved
DIVCLK
Time-out
Label
Label
Label
Bit Position
Bit Position
Position
15:14
15:12
13:0
12:11
15:13
Bit
9:0
10
11
Table 63 - Timing Reference Processing Control Register
Table 61 - Master Clock Generation Control Register
Table 62 - Master Clock / CLKx2 Division Factor
Type
Type
R/W
R/W
R/W
R/W
R/W
R/W
Type
R/W
R/W
This value is used to indicate a time-out period, after which if no timing reference cells or
markers have been received, a Loss of Timing Reference Cells (LOSS_TIMRF in 6082h)
event will be indicated. The time-out period is calculated in multiples of 65536 MCLK
periods. “00_0000_0000” is an illegal value (i.e. time-out is a minimum of 65536 cycles of
MCLK).
When ‘0’, indicates that clock recovery is based on Timing Reference Cell arrival events.
When ‘1’, indicates that clock recovery is based on 8 kHz marker arrival events.
When ‘1’, enable CRC and parity checking on AAL1 sequence number field in state
machine. See Figure 31 on page 70.
Reserved. Should be written as “0000”.
This value plus two is used to divide MCLK or CLKx2 to get an 8 kHz reference. Value
0000h means divide-by-two, 0001h means divide-by-three, ..., 3FFEh means divide-by-
16,384.
Reserved. Should be written as “00”.
Clock Failure Detection - FREERUN Signal Control
00 -> FREERUN is always activated (FREERUN pin is HIGH)
01 -> FREERUN is activated when status bit REFFAIL (in the Clock Module General
Status Register at 6082h) is ‘1’. In the event of REF8KCLK clock failure, it is the software’s
responsibility to change the programming from “01” to “00” before clearing the REFFAIL
status bit.
1X -> FREERUN is always deactivated (FREERUN pin is LOW)
Reserved. Should be written as “000”.
Description
Description
Description
MT90500
107