IDT82V2108
T1 / E1 / J1 OCTAL FRAMER
Operation
109
March 5, 2009
4.2.2
OPERATION IN J1 MODE
The IDT82V2108 can also be operated in J1 mode when the
TEMODE (b0, 400H) is set to logic 1. Except for the setting of the JYEL
in bit 3 of FRMP Configuration registers (020H, 0A0H, 120H, 1A0H,
220H, 2A0H, 320H, 3A0H), the J1_YEL in bit 5 of ALMD Configuration
registers (02CH, 0ACH, 12CH, 1ACH, 22CH, 2ACH, 32CH, 3ACH) and
the J1_YEL in bit 5 and the J1_CRC in bit 6 of FRMG Configuration reg-
isters (044H, 0C4H, 144H, 1C4H, 244H, 2C4H, 344H, 3C4H), the set-
ting of the other registers is the same as the setting in T1 mode.
The follows illustrate the setting in the J1 mode which is different
from the setting in the T1 mode.
In receive path, set the JYEL in bit 3 of FRMP Configuration regis-
ters (020H, 0A0H, 120H, 1A0H, 220H, 2A0H, 320H, 3A0H) to logic 1,
the Frame Processor will operate in J1 mode. Set the J1_YEL in bit 5 of
ALMD Configuration registers (02CH, 0ACH, 12CH, 1ACH, 22CH,
2ACH, 32CH, 3ACH) to logic 1, the Alarm Detector will operate in J1
mode.
In transmit path, set the J1_CRC in bit 6 of FRMG Configuration
registers (044H, 0C4H, 144H, 1C4H, 244H, 2C4H, 344H, 3C4H) to logic
1, the Frame Generator will generate J1 frame. Set the J1_YEL in bit 5
of FRMG Configuration registers (044H, 0C4H, 144H, 1C4H, 244H,
2C4H, 344H, 3C4H) to logic 1, the IDT82V2108 will transmit the Yellow
alarm in J1 format if Yellow alarm transmission is enabled.
4.2.3
VARIOUS OPERATION MODES CONFIGURATION
Five operation modes can be set in the receive path and four oper-
ation modes can be set in the transmit path. In each operation modes,
Table 52: Various Operation Modes in Receive Path for Reference
Mode
Register 1
Value (from Bit7 to Bit0)
Description 2
Receive Clock
Slave RSCK
Reference Mode
001H
10000000
In the Receive Clock Slave RSCK Reference mode.
003H
00010011
Enable the normal operation of the RSDn pin. The data on RSDn is updated on the rising edge
of RSCCK. The data on RSCFS is sampled on the falling edge of RSCCK.
020H
00110000
The Frame Processor is set in the ESF format. The CRC-6 calculation is performed when mimic
framing pattern is present.
02CH
00010000
The Alarm Detector is set in the ESF format.
040H
00000100
The Receive CAS/RBS Buffer is set in the ESF format.
Receive Clock
Slave External
Signaling Mode
(1.544 Mbit/s)
001H
11000000
In the Receive Clock Slave External Signaling mode. The backplane rate is 1.544 Mbit/s.
003H
00010011
Enable the normal operation of the RSDn and RSSIGn pins. The data on RSDn and RSSIGn is
updated on the rising edge of RSCCK. The data
on RSCFS is sampled on the falling edge
of RSCCK.
020H
00110000
The Frame Processor is set in the ESF format. The CRC-6 calculation is performed when mimic
framing pattern is present.
02CH
00010000
The Alarm Detector is set in the ESF format.
040H
00000100
The Receive CAS/RBS Buffer is set in the ESF format.
Receive Clock
Slave External
Signaling Mode
(2.048 Mbit/s)
001H
11010000
In the Receive Clock Slave External Signaling mode. The backplane rate is 2.048 Mbit/s.
003H
00010011
Enable the normal operation of the RSDn and RSSIGn pins. The data on RSDn and RSSIGn is
updated on the rising edge of RSCCK. The data on RSCFS is sampled on the falling edge of
RSCCK.
020H
00110000
The Frame Processor is set in the ESF format. The CRC-6 calculation is performed when mimic
framing pattern is present.
02CH
00010000
The Alarm Detector is set in the ESF format.
040H
00000100
The Receive CAS/RBS Buffer is set in the ESF format.
Receive Clock
Master Full T1/
J1 Mode
001H
01000000
In the Receive Clock Master Full T1/J1 mode.
003H
00010000
Enable the normal operation of the RSDn pin. The data on RSDn and RSFSn is updated on the
rising edge of RSCK.
020H
00000000
The Frame Processor is set in the SF format.
02CH
00000000
The Alarm Detector is set in the SF format.
040H
00000000
The Receive CAS/RBS Buffer is set in the SF format.