DS21458-W+ Maxim Integrated, DS21458-W+ Datasheet - Page 53

• Manufacturer Part Number: DS21458-W+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS21458-W+

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: CSBGA
• Minimum Operating Temperature: 0 C
• Operating Supply Voltage: 3.3 V
• Supply Voltage - Max: 3.465 V
• Supply Voltage - Min: 3.135 V
• Part # Aliases: 90-21458+W00

10. T1 FRAMER/FORMATTER CONTROL REGISTERS
The T1 framer portion of the DS21455/DS21458 is configured via a set of nine control registers.
Typically, the control registers are only accessed when the system is first powered up. Once the device
has been initialized, the control registers will only need to be accessed when there is a change in the
system configuration. There are two receive-control registers (T1RCR1 and T1RCR2), two transmit
control registers (T1TCR1 and T1TCR2), and a common control register (T1CCR1). Each of these
registers is described in this section.
10.1 T1 Control Registers
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 0/Resynchronize (RESYNC). When toggled from low to high, a resynchronization of the receive side framer is initiated.
Must be cleared and set again for a subsequent resync.
Bit 1/Sync Enable (SYNCE).
Bit 2/Sync Time (SYNCT).
Bit 3/Sync Criteria (SYNCC).
Bits 4 to 5/Out-of-Frame Select Bits (OOF2, OOF1).
Bit 6/Auto Resync Criteria (ARC).
Bit 7/Unused, must be set to zero for proper operation.
OOF2
0
0
1
1
0 = auto resync enabled
1 = auto resync disabled
0 = qualify 10 bits
1 = qualify 24 bits
In D4 Framing Mode:
0 = search for Ft pattern, then search for Fs pattern
1 = cross couple Ft and Fs pattern
In ESF Framing Mode:
0 = search for FPS pattern only
1 = search for FPS and verify with CRC6
0 = resync on OOF or RCL event
1 = resync on OOF only
OOF1
—
7
0
0
1
0
1
ARC
T1RCR1
T1 Receive Control Register 1
03h
6
0
OUT-OF-FRAME CRITERIA
2/4 frame bits in error
2/5 frame bits in error
2/6 frame bits in error
2/6 frame bits in error
OOF1
5
0
OOF2
4
0
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SYNCC
3
0
DS21455/DS21458 Quad T1/E1/J1 Transceivers
SYNCT
2
0
SYNCE
1
0
RESYNC
0
0