Insert Register; Preliminary; Drop Register - NEC UPD98413 User Manual

3.5.1 Insert Register

A value set to the insert register is stored to a specific position in the transmit OH byte and transmitted. Unless
the value of the register is changed, the default value of the insert register is stored and transmitted.
The OH insert register function is lower priority than the transmission of the J0 and J1 trace message, the OH
insert interface, the Section and Line DCC insert interface and the internal processing of the µ PD98413. If such
processing works, the value set to the insert register is overwritten.
Low
OH insert register
transmission command

3.5.2 Drop Register

The drop registers store the contents of the OH byte of the receive frame. The CPU can obtain the received
contents by reading these registers. The contents of the drop registers, except the K12R, C2R, Z2FDR and Z2FMR
registers, are updated each time a frame is received. The K12R, C2R, Z2FDR and Z2FMR registers are updated in
the following conditions.
K12R
This register is updated if the values of the K1 and K2 are the same in three frames received continuously after the
different value from that received previously is detected. When this register is updated, the µ PD98413 indicates it
to the APS bit of the DSLER register and interrupt.
C2R
This register is updated if the same value is received in three or five, which is set to the MDPOHR register, frames
continuously.
Z2FDR
This register is updated if the values of the bit6-7 of 1st Z2 are the same in six frames received continuously after
the different value from that received previously is detected.
indicates it to the Z2D bit of the DSLER register and interrupt.
Z2FMR
This register is updated if the values of the bit7-8 of 1st Z2 are the same in 12 frames received continuously after
the different value from that received previously is detected.
indicates it to the Z2M bit of the DSLER register and interrupt.
CHAPTER 3 FUNCTIONAL OUTLINE
Priority
J0, J1 byte
trace message
Section and Line DCC

PRELIMINARY

OH insert interface
insert interface
When this register is updated, the µ PD98413
When this register is updated, the µ PD98413
High
µ
Internal processing of PD98413
• BIP, REI processing
• Pointer processing
• Transmission of alarm
NEC confidential and Proprietary
99