dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 31

• Manufacturer Part Number: dp83251
• Description: Player Device Fddi Physical Layer Controller
• Manufacturer: National Semiconductor Corporation

5 0 Registers
INJECTION SYMBOL REGISTER B (ISRB)
The Injection Symbol Register B along with Injection Symbol Register A contains the programmable value (already in 5B code)
that will replace the data symbol pairs
The One Shot mode ISRA and ISRB are injected n bytes after the next JK where n is the programmed value of the Injection
Threshold Register In the Periodic mode ISRA and ISRB are injected every nth symbol pair In the Continuous mode all data
symbols are replaced with ISRA and ISRB
ACCESS RULES
D0
D1 – 3
D4
D5
D6
D7
D7
RES
ADDRESS
Bit
07h
D6
RES
(Continued)
IJS5
IJS6 – 8
IJS9
RES
RES
RES
Symbol
READ
Always
D5
RES
D4
IJS9
INJECTION THRESHOLD BIT
Symbol Register B
INJECTION THRESHOLD BIT
Register B
INJECTION THRESHOLD BIT
Symbol Register B
RESERVED Reserved for future use
Note Users are discouraged from using this bit The reserved bit is set to 1 during the reset
process It may be set or cleared without any effects to the functionality of the PLAYER
device
RESERVED Reserved for future use
Note Users are discouraged from using this bit The reserved bit is set to 1 during the reset
process It may be set or cleared without any effects to the functionality of the PLAYER
device
RESERVED Reserved for future use
Note Users are discouraged from using this bit The reserved bit is set to 1 during the reset
process It may be set or cleared without any effects to the functionality of the PLAYER
device
WRITE
Always
D3
IJS8
31
D2
IJS7
k
k
k
5
9
6 – 8
Description
l
l
Least significant bit (LSB) of Injection
Most significant bit (MSB) of Injection
l
D1
IJS6
Intermediate bits of Injection Symbol
D0
IJS5