Optional I/F Circuit - Citizen CL-S400DT Technical Manual

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