Service manual

FO-4400U
FO-CS1
5 – 13
PIN I/O Name Interface
1 — RESERVED NC
2 IA RS2 HOST Interface
3 IA RS3 HOST Interface
4 IA RS4 HOST Interface
5 IA /CS OHOST Interface
6 IA /WR HOST Interface
7 IA /RD HOST Interface
8 OA /RDCLK DTE Serial Interface
9 OA /RLSD DTE Serial Interface
10 OA TDCLK DTE Serial Interface
11 IA TXD DTE Serial Interface
12 OA /CTS DTE Serial Interface
13 PWR VDD1 —
14 — RESERVED NC
15 — RESERVED NC
16 GND VSS —
17 — NC NC
18 IA /RESET Modem Interconnect
19 OA SR4OUT Modem Interconnect
20 — NC NC
21 IA SR4IN Modem Interconnect
22 OA CLK OUT Modem Interconnect
23 OA EYESYNC Diagnostic Signal
24 OA EYECLK Diagnostic Signal
25 GND MAVSS —
26 PWR MAVDD —
27 O(DF) SPKR Telephone Line Interface
28 O(DD) TXA2 Telephone Line Interface
29 O(DD) TXA1 Telephone Line Interface
30 MI VREF Modem Interconnect
31 MI VC Modem Interconnect
32 I(DA) RIN Telephone Line Interface
33 AGND MAVSS —
34 IA /POR Modem Interconnect
35 — RESERVED NC
36 — RESERVED NC
37 O(DD) /TALK Telephone Line Interface
38 PWR VDD —
39 — RESERVED NC
40 — RESERVED NC
41 — NC NC
42 IA M CNTRL SIN Modem Interconnect
43 IA M CLKIN Modem Interconnect
44 IA M TXSIN Modem Interconnect
45 IA M SCK Modem Interconnect
46 IA M RXOUT Modem Interconnect
47 IA M STROBE Modem Interconnect
48 — RESERVED NC
49 O(DD) OH Telephone Line Interface
50 PWR VDD —
FM336Plus (IC30) Terminal description
PIN I/O Name Interface
51 — RESERVED NC
52 GND VSUB —
53 GND VSS —
54 — NC NC
55 — NC NC
56 MI SLEEP Modem Interconnect
57 PWR VDD1 —
58 — NC NC
59 — RESERVED NC
60 — RESERVED NC
61 MI SR1IO Modem Interconnect
62 PWR VCORE —
63 PWR VDD1 —
64 IA XTCLK DTE Serial Interface
65 GND VSS —
66 — RESERVED NC
67 OA RXD DTE Serial Interface
68 IA /DTR DTE Serial Interface
69 PWR VDD1 —
70 MI IA SLEEP Modem Interconnect
71 PWR VGG —
72 OA YCLK Overhead Signal
73 OA XCLK Overhead Signal
74 OA EYEXY Diagnostic Siganl
75 OA /DSR DTE Serial Interface
76 OA /RI Telephone Line Interface
77 IA RINGD Telephone Line Interface
78 IA /RTS DTE Serial Interface
79 OA IRQ HOST Interface
80 GND VSS —
81 MI GP00 Modem Interconnect
82 — RESERVED NC
83 — RESERVED NC
84 PWR VDD1 —
85 I XTALI/CLKIN Overhead Signal
86 O XTALO Overhead Signal
87 IA/OB D0 HOST Interface
88 IA/OB D1 HOST Interface
89 IA/OB D2 HOST Interface
90 IA/OB D3 HOST Interface
91 IA/OB D4 HOST Interface
92 PWR VDD1 —
93 IA/OB D5 HOST Interface
94 IA/OB D6 HOST Interface
95 IA/OB D7 HOST Interface
96 IA/OB RS0 HOST Interface
97 IA/OB RS1 HOST Interface
98 PWR PLL VDD —
99 GND VSS —
100 GND PLL GND —
Notes:
1. I/O types: MI: Modem interconnect IA, IB: Digital input O(DD), O(DF): Analog input
I(DA): Analog input OA, OB: Digital output
2. NC= No external connection required. RESERVED= No external connection allowed.
3. Interface Legend:
HOST= Modem Control Unit (Host)
DET= Data Terminal Equipment