DP83257VF National Semiconductor, DP83257VF Datasheet - Page 43

• Manufacturer Part Number: DP83257VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83257VF

• 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: *DP83257VF

Bit
D0
D1
D2
D3
D4
D5
D6
D7
5 0 Registers
5 1 MODE REGISTER (MR)
The Mode Register is used to initialize and configure the PLAYER
ACCESS RULES
RNRZ
Symbol
RUN
SILB
LILB
CM
TQL
TE
TNRZ
RNRZ
D7
ADDRESS
00h
RUN E STOP
0 Enables the STOP mode Refer to section 4 2 STOP MODE for more information
1 Normal operation (i e RUN mode)
Note The RUN bit is automatically set to 0 when the E RST pin is asserted (i e set to ground)
SHORT INTERNAL LOOPBACK
0 Disables Internal Loopback mode (i e normal operation)
1 Enables Internal Loopback mode
Refer to section 4 3 LOOPBACK MODE for more information
LONG INTERNAL LOOPBACK
0 Disables Long Internal Loopback mode (i e normal operation)
1 Enables Long Internal Loopback mode
Note Long Internal Loopback should not be used when the Alternate PMD Interface is enabled
Refer to section 4 3 LOOPBACK MODE for more information
CASCADE MODE
0 Disables synchronization of cascaded PLAYER
1 Enables the synchronization of cascaded PLAYER
Refer to section 4 4 CASCADE MODE for more information
Note Cascade Mode is only available on the DP83257 device The other devices do not have the required CS and CR pins Do not set this bit for
TRANSMIT QUIET LEVEL This bit is used to program the transmission level of the Quiet symbols during Off
Transmit mode (OTM) only
0 Low (PMD OFF) level Quiet symbols are transmitted through the PMD Data Request pins (i e PMRD
1 High (PMD ON) level Quiet symbols are transmitted through the PMD Data Request pins (i e PMRD
TRANSMIT ENABLE The TE bit controls the action of the PMD transmitter Enable (TXE) pin When TE is 0 the
TXE output disables the PMD transmitter when TE is 1 the PMD transmitter is disabled during the Off Transmit
Mode (OTM) and enabled otherwise The On and Off level of the TXE is depended on the PMD transmitter Enable
Level (TEL) pin to the PLAYER
1 If TE
2 If TE
3 If TE
TRANSMIT NRZ DATA
0 Transmits data in Non-Return-To-Zero-Invert-On-Ones (NRZI) format (normal format)
1 Transmits data in Non-Return-To-Zero format (NRZ)
RECEIVE NRZ DATA
0 Receives data in Non-Return-To-Zero-Invert-On-Ones format (NRZI) (normal format)
1 Receives data in Non-Return-To-Zero format (NRZ)
TNRZ
PMRD
PMRD
D6
any device but the DP83257
e
e
e
(Continued)
0 then TXE
1 and OTM then TXE
1 and not OTM then TXE
b e
b e
Always
READ
high)
low)
D5
TE
e
Off
TQL
D4
a
e
WRITE
Always
Off
device The following rules summaries the output of TXE
e
On
CM
D3
43
a
Description
a
devices
a
device
devices
LILB
D2
SILB
D1
RUN
D0
a e
a e
high
low