DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 208

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

31. PROGRAMMABLE BACKPLANE CLOCK SYNTHESIZER
The DS21455/DS21458 contain an on-chip clock synthesizer that generates a user-selectable clock
referenced to the recovered receive clock (RCLK). The synthesizer uses a phase-locked loop to generate
low-jitter clocks. Common applications include generation of port and backplane system clocks.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 0/Backplane Clock Enable (BPEN).
Bits 1 to 2/Backplane Clock Selects (BPCS0, BPCS1).
Bit 3/Unused, must be set to zero for proper operation.
Bit 4/Unused, must be set to zero for proper operation.
Bit 5/Unused, must be set to zero for proper operation.
Bit 6/Unused, must be set to zero for proper operation.
Bit 7/Unused, must be set to zero for proper operation.
BPCS1
0
0
1
1
0 = disable BPCLK pin (Pin held at logic 0)
1 = enable BPCLK pin
—
7
0
BPCS0
0
1
0
1
—
CCR2
Common Control Register 2
71h
6
0
BPCLK FREQUENCY (MHz)
—
5
0
16.384
8.192
4.096
2.048
—
4
0
208 of 270
—
3
0
BPCS1
2
0
BPCS0
1
0
BPEN
0
0