82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 84

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

REFA - REFA Clock Sources Configuration Register
REFB - REFB Clock Sources Configuration Register
Address: 280H
Type: Read / Write
Default Value: 41H
Address: 240H
Type: Read / Write
Default Value: 41H
Programming Information
IDT82P2821
4 - 0
4 - 0
Bit
Bit
7
6
5
7
6
5
7
7
-
-
CKB_T1E1
CKA_T1E1
REFB_EN
REFB[4:0]
REFA_EN
REFA[4:0]
Name
Name
-
-
REFB_EN
REFA_EN
6
6
Reserved.
This bit controls whether the output on the REFA pin is enabled.
0: The output is disabled. REFA is in High-Z state.
1: The output is enabled. (default)
This bit defines the input clock frequency on the CLKA pin.
0: Input T1 clock. (default)
1: Input E1 clock.
These bits select the clock source for REFA.
00000: Recovered clock of channel 0.
00001: Recovered clock of channel 1. (default)
00010: Recovered clock of channel 2.
......
10100: Recovered clock of channel 20.
10101: Recovered clock of channel 21.
10110 ~ 11111: The input on CLKA.
Reserved.
This bit controls whether the output on the REFB pin is enabled.
0: The output is disabled. REFB is in High-Z state.
1: The output is enabled. (default)
This bit defines the input clock frequency on the CLKB pin.
0: Input T1 clock. (default)
1: Input E1 clock.
These bits select the clock source for REFB.
00000: Recovered clock of channel 0.
00001: Recovered clock of channel 1. (default)
00010: Recovered clock of channel 2.
......
10100: Recovered clock of channel 20.
10101: Recovered clock of channel 21.
10110 ~ 11111: The input on CLKB.
CKA_T1E1
CKB_T1E1
5
5
REFA4
REFB4
4
4
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
84
REFB3
REFA3
3
3
Description
Description
REFB2
REFA2
2
2
REFB1
REFA1
1
1
February 6, 2009
REFB0
REFA0
0
0