dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 52

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

5 0 Registers
CURRENT TRANSMIT STATE COMPARISON REGISTER (CTSCR)
The Current Transmit State Comparison Register ensures that the Control Bus must first read a bit modified by the PLAYER
device before it can be written to by the Control Bus Interface
The current state of the Current Transmit State Register (CTSR) is automatically written into the Current Transmit State
Comparison Register A (i e CTSCR
During a Control Bus Interface write-cycle the PLAYER device will set the Conditional Write Inhibit bit (CWI) of the Interrupt
Condition Register (ICR) to 1 and disallow the setting or clearing of a bit within the CTSR when the value of a bit in the CTSR
differs from the value of the corresponding bit in the Current Transmit State Comparison Register
ACCESS RULES
D0
D1
D2
D3
D4
D5
D6
D7
D7
RESC
ADDRESS
Bit
1Bh
D6
PRDPEC
(Continued)
TM0C
TM1C
TM2C
IC0C
IC1C
SEC
PRDPEC
RESC
Symbol
READ
Always
D5
SEC
e
CTSR) during a Control Bus Interface read-cycle of CTSR
D4
IC1C
WRITE
Always
TRANSMIT MODE
Transmit Mode
TRANSMIT MODE
Transmit Mode
(CTSR)
TRANSMIT MODE
Transmit Mode
(CTSR)
INJECTION CONTROL
Injection Control
(CTSR)
INJECTION CONTROL
Injection Control
SMOOTHER ENABLE COMPARISON The comparison bit for the Smoother
Enable bit (SE) to the Current Transmit State Register (CTSR)
PHY REQUEST DATA PARITY ENABLE COMPARISON The comparison
bit for the PHY Request Data Parity Enable bit (PRDPE) of the Current
Transmit State Register (CTSR)
RESERVED COMPARISON The comparison bit for the Reserved bit (RES)
of the Current Transmit State Register (CTSR)
D3
IC0C
52
k
k
k
k
k
0
1
2
l
l
l
0
1
k
k
k
l
l
0
(TM0) of the Current Transmit State Register (CTSR)
1
bit (TM1) of the Current Transmit State Register
2
bit (TM2) of the Current Transmit State Register
D2
TM2C
l
l
l
bit (IC0) of the Current Transmit State Register
bit (IC1) of the Current Transmit Register (CTSR)
k
k
COMPARISON The comparison bit for the
COMPARISON The comparison bit for the
COMPARISON The comparison bit for the
0
1
l
l
COMPARISON The comparison bit for the
COMPARISON The comparison bit for the
Description
D1
TM1C
D0
TM0C