Uc (Used Cell) Counter Maximum Threshold Value Register; (00D0H, 00D4H, 00D8H, 00Dch, 00E0H, 00E8H) - NEC mPD98410 User Manual

4.3.30 UC (Used Cell) counter maximum threshold value register (00D0h, 00D4h, 00D8h, 00DCh, 00E0h, 00E8h)
Register name Address
UCthCBR 00D0h
UCthRVR 00D4h
UCthRM 00D8h
UCthNVR 00DCh
UCthABR 00E0h
UCthUBR 00E8h
15 14 13
These registers set the upper-limit threshold value of the Used Cell Counter in each class. If a cell in each class is
congested in the cell buffer, exceeding the corresponding threshold value, the cell is discarded.
Field Bit
UCthCBR bit [15:7]
UCthRVR bit [15:7]
UCthRM bit [15:7]
UCthNVR bit [15:7]
CHAPTER 4 INTERNAL REGISTERS
Default
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
0000_0000_0xxx_xxxx
12 11 10 9 8
UCthCBR
UCthRVR
UCthRM
UCthNVR
UCthABR
UCthUBR
R/W
R/W 0000_0000_0 to 1111_1111_1: Upper-limit threshold value in CBR
R/W 0000_0000_0 to 1111_1111_1: Upper-limit threshold value in
R/W 0000_0000_0 to 1111_1111_1: Upper-limit threshold value in RM
R/W 0000_0000_0 to 1111_1111_1: Upper-limit threshold value in
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7 6 5 4 3
Function
class
(128-cell units: 0/128/256/ ... /65408)
rtVBR class
(128-cell units: 0/128/256/ ... /65408)
class
(128-cell units: 0/128/256/ ... /65408)
nrtVBR class
(128-cell units: 0/128/256/ ... /65408)
2 1 0
Default Value
0000_0000_0
(0000h)
0000_0000_0
(0000h)
0000_0000_0
(0000h)
0000_0000_0
(0000h)
165