DP83256VF National Semiconductor, DP83256VF Datasheet - Page 49

• Manufacturer Part Number: DP83256VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor
• Series: PLAYER+™r

Specifications of DP83256VF

• Controller Type: physical layer controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *DP83256VF

D3 D4
D5
D6
D7
5 0 Registers
Bit
IC0 IC1
SE
PRDPE
RES
Symbol
Injection Control
over data from the Smoother Repeat Filter Encoder and Transmit Modes
IC0 is the only bit of the register that is automatically cleared by the PLAYER
Injection is executed The automatic clear of IC0 during the One Shot mode can be interpreted as a
acknowledgment that the One Shot has been completed
IC1
0
0
1
1
SMOOTHER ENABLE
0
1
Note Once the counter has started it will continue to count irrespective of the incoming symbols with the exception of a JK symbol pair
PHY REQUEST DATA PARITY ENABLE
0
1
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
(Continued)
effects to the functionality of the PLAYER
IC0
0
1
0
1
Disables the Smoother
Enables the Smoother
When enabled the Smoother can redistribute Idle symbol pairs which were added or deleted by the
local or upstream receivers
Disables PHY Request Data parity
Enables PHY Request Data parity
No Injection The normal transmission of incoming PHY Request data (i e symbols are not
injected)
One Shot In one shot mode the contents of Injection Symbol Register A (ISRA) and Injection
Symbol Register B (ISRB) are injected n symbol pairs after a JK where n is the programmed
value of the Injection Count Register (IJCR) If IJCR is set to 0 the JK symbol pair is replaced by
ISRA and ISRB Once the One Shot is executed the PLAYER
0 thereby returning to normal transmission of data
Periodic In Periodic mode the contents of Injection Symbol Register A (ISRA) and Injection
Symbol Register B (ISRB) are injected every n-th symbol pair where n is the programmed value
of the Injection Count Register (IJCR) If IJCR is set to 0 all data symbols are replaced with ISRA
and ISRB
Note The inserted symbol is not automatically aligned to a JK boundary
Continuous In Continuous mode all data symbols are replaced with the contents of Injection
Symbol Register A (ISRA) and Injection Symbol Register B (ISRB)
k
0 1
l
These bits select one of the 4 injection modes The injection modes have priority
a
device
49
Description
a
a
device automatically sets IC0 to
device after the One Shot