UPD98405 Datasheet, PDF (20/64 Pages) NEC – 155M ATM INTEGRATED SAR CONTROLLER

µPD98405
1.4 PMD Interface Signals (internal PHY mode, PHM of GMR register = 0)
The PMD interface is used to connect a module such as an optical transceiver/receiver.
Pin Name
RDIT
RDIC
Pin No.
278
277
RCIT (shared
249
with FULL_B)
RCIC (shared
248
with
EMPTY_B)
REFCLK
268
(shared with
PHINT_B)
TDOT
273
TDOC
274
TFKT (shared
242
with Rx0)
TFKC
241
(shared with
Rx1)
PHYALM
266
(shared with
PHR/W_B)
SD
267
(shared with
PHCE_B)
I/O
I/O Level
Function
I
P-ECL
Receive serial data input.
True (+) Pull up this pin when it is not used.
I
P-ECL
Receive serial data input.
complement Pull down this pin when it is not used.
(–)
I
P-ECL
Receive serial clock input.
True (+) This pin is used when an external clock recovery/synthesizer is
connected (PLL of GMR register = 1).
Pull up this pin when it is not used.
I
P-ECL
Receive serial clock input.
complement This pin is used when an external clock recovery/synthesizer is
(–)
connected (PLL of GMR register = 1).
Pull down this pin when it is not used.
I
TTL
Reference clock.
This pin inputs a system clock (19.44 MHz) to the internal clock
recovery/synthesizer.
Pull up this pin when it is not used.
O
P-ECL
Transmit serial data output.
True (+)
O
P-ECL
Transmit serial data output.
complement
(–)
I
P-ECL
Transmit serial clock input.
True (+) This pin is used when an external clock recovery/synthesizer is
connected (PLL of GMR register = 1).
Pull up this pin when it is not used.
I
P-ECL
Transmit serial clock input.
complement This pin is used when an external clock recovery/synthesizer is
(–)
connected (PLL of GMR register = 1).
Pull down this pin when it is not used.
O
TTL
PHY layer alarm detection signal.
This signal is asserted active (high) when any of the internally
monitored error statuses (CMDARM, LOS, OOF, LOF, LOP,
OCD, LCD, Line AIS, Path AIS, Line RDI, and Path RDI) is
detected. The error status to be reported can be selected by
using the internal AMR1 and AMR2 registers. One or more
error statuses can be selected.
I
TTL
Signal detect.
This pin inputs the signal detect signal (when LOS is detected,
etc.) of the PMD device. When a low level is input to this pin,
the µPD98405 assumes LOS detection.
Pull up this pin when it is not used.
20
Data Sheet S12689EJ2V0DS00