Rev. 1.0, 02/00, page 619 of 1141
W
W
R
UDF
OVF
Lock 2 up
Clear
Latch
Preset
DFVCR
DFRLOR
DFVCR
DFPR
DFVCR
DFVCR
DFVCR
DFUCR
FGCR
DFER
DFRVCR
Error data
(16 bits)
To DFU
ADDFGN
NCDFG
DFRUDR
Internal bus
W
R/W
Internal bus
R/W
W
R/W
R/W
R/W
R/W
(R)/W
Lock 1 up
S
R
F/F
Q
S
R
F/F
DFRCS1,0
DF-R/UNR
Lock counter
(2 bits)
Q
S
R
F/F
Q
Lock range
detector
Lock range data 1 (16bit)
DPCNT
Error data
limiter
control circuit
DFEFON
DFESS
DRF
Edge
detector
↑
,
↓
Error data (16 bits)
Counter (16 bits)
DFOVF
IRRDRM2
IRRDRM1
To DROCKON
DFU
Preset data
(16 bits)
Lock range data 2
(16 bits)
DFCS1,0
φ
s
φ
s/2
φ
s/4
φ
s/8
Figure 26.27 Block Diagram of the Drum Speed Error Detector