NEC Network Controller uPD98502 - Manual (Page 56)

CHAPTER 1 INTRODUCTION
56 Preliminary User’s Manual S15543EJ1V0UM
1.12 Clock Control Unit
This section describe µPD98502’s internal clock is supplied by Clock Control Unit (CCU) with following figure.
Figure 1-13. Block Diagram of Clock Control Unit
U AR T
25/16.7
M H z
P L L
(x 6 )
1 /2
1 /3
C C U (C L O C K C O N T R O L U N IT )
AT M C e ll
P ro c e s s o r
33/25/16.5 M H z
66 M H z
U S B
C o n tro lle r
48 M H z
U S B C LK (12 M H z)
P e rip h e ra l
100/66 M H z
S ys te m
C o n tro lle r
m acstop
usbstop
atm stop
1/3
S C LK (33 M H z)
100/66M H z
66 M H z
E th e rn e t
C o n tro lle r
# 1
25 M H z
25 M H z
M IR C LK (25 M H z)
M IT C LK (25 M H z)
66 M H z
66 M H z
E th e rn e t
C o n tro lle r
# 2
25 M H z
25 M H z
M IR C LK (25 M H z)
M IT C LK (25 M H z)
66 M H z
P C I
C o n tro lle r
P C IC LK (33 M H z)
66 M H z
IB U S
pcistop
m ac2stop
C L O C K
E N AB L E R
C L O C K
E N AB L E R
C L O C K
E N AB L E R
C L O C K
E N AB L E R
C L O C K
E N AB L E R
1/2
1/4
1/8
66 M H z
S E L
V R 4 1 2 0 A
U R T C LK
(18.432 M H z)