Citizen CL-S400DT - Optional I;F Circuit

Chapter 2 Operating Principles
2-2. Operation of Control Parts
2-27 CL-S400DT
(7) Optional I/F circuit
The optional I/F circuit consists of U24 (USB controller). The optional I/F circuit is controlled by
U24, FPGA (U11) and CPU (U1A).
42
47
11
48
INT0
INT1/SOF
Dreq0
Dack0
U24
5
6
3
4
UB2INTP0
UB2INTP1
UBREQ
UBACK
[SA Main PCB]
M66291GP
nRESET
To/From
U1A CPU
and
To/From
U11 FPGA
To/From
U11
FPGA
23
22
21
nSLCT-IN/CTS, nATFD-XT/DSR
nSTROBE/OCIO, nINIT/nPRIME
BUSY/RTS, nACKNLG/DTR
nFAULT, SLCT/PPON0
PE, DSWOUT, TXD0/SO0/OBDIR
RXD0/SI0, SCK0, IFRESET
VBUS
USB_D-
USB_D+
I/F
D0-D15
A1-A6
USB Controller
45
41
44
46
CS
LWR
HWR/BYTE
RST
nUSBCS
LLDQM/nLLBE
LUDQM/nLUBE
+3.3V
TrON
Vbus
D-
D+
DATA0-DATA7
+24V
+5V
To/From
U1A CPU
J17
14
Xin
USBCLK
28-32
20
4-11
1-3
12-18
24
25-27
23-40
17-22
D0-D15
A1-A6
1,12,
16,35
R144
43
RD
nRD