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Si2493/57/34/15/04
Global ISOmodem-EVB
Rev. 0.6 17
TXCLK_H
RESETb
DCD_H
AOUT_H
DCD_HEESD_H TXCLK_H
RESETb
RESETb
EESD_H
AOUT_H
VD
+3.3V
+3.3V
VCC
VCC
VD
+3.3V
USB
RS-232
"7-12V AC or DC"
"RESET"
JP7 for measuring
current to modem (i.e.
VD goes to modem only)
"Mux off"
"USB"
Info
Info
Ctrl
Ctrl
Info GPIO4 or AOUT INT or AOUT nc or GPIO4
Table on silkscreen for JP6
RS-232 Si2400 only Si2456/57 Si2401
CD nc or GPIO2 DCD or EEIO GPIO2 or nc
RI GPIO3 or nc RI or TXCLK nc or GPIO5
DTR ESC or X GPIO3 or nc
RTS CLKOUT or nc RTS or RXCLK nc or GPIO1
DSR
Function
"RXD"
"TXD"
"CTSb"
"RESETb"
"RTSb"
"DCDb"
"INT"
"AOUT"
"RIb"
"ESC"
Place White Dot
Silkscreen Near
Pin 1
"CLKOUT"
"TXCLK"
"RXCLK"
"EESD"
GPIO1 or GPIO3
"Si2401: 1-2, 5-6, 7-8, 11-12, 14-15"
"Si2400: 2-3, 4-5, 8-9, 11-12, 13-14"
"Si24xx: 1-2, 4-5, 7-8, 10-11, 13-14"
"Si24xx alt: 1-2, 5-6, 7-8, 11-12, 14-15"
"JP6: recommended settings"
Place White Dot
Silkscreen Near
Pin 1
Right angle connector on board edge
Si24xx Reset Options
"AUTOBAUD" "EEPROM" "27MHz CLK"
"RING"
"TIP""PCM"
"EEPROM"
"Si2401 27MHz CLK"
Si2401 Reset Options
JP7
JP5
R9
0
B4 UART Mux
TXD_T
RTS_T
DTR_T
TXD_U
RTS_U
DTR_U
RXD_M
CTS_M
DSR_M
CD_M
RI_M
RXD_T
CTS_T
DSR_T
CD_T
RI_T
RXD_U
CTS_U
DSR_U
CD_U
RI_U
TXD_M
DTR_M
RTS_M
OE
S
JP11
R6 0
R11
10k
JP3
HEADER 8X2
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
R1
0
NI
JP13
JP6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R2
LS1
Speaker
B1
RS-232
RXD_T
CTS_T
RTS_T
DTR_T
DSR_T
CD_T
RI_T
TXD_R
DTR_R
DSR_R
RXD_R
RD_R
CD_R
CTS_R
TXD_TRTS_R
C32
J3
Power Connector
1
2
J5
USB Type B
1
2
3
4
5
R7 0
B2
USB
RXD_U
CTS_U
DSR_U
CD_U
RI_U
TXD_U
RTS_R
DTR_U
USB-
USB+
R12
10k
TP7
R8
1.3k
J4
2.1 mm Power jack
1
2
B5
Daughter Card Socket
RXD_H
CTS_H
RESET_H
RI_H
DCD_H
AOUT_H
RING
TIP
TXD_H
ESC_H
RTS_H
CLKOUT_H
INT_H
EESD_H
TXCLK_H
RXCLK_H
EESD_H
EECS_H
EECLK_H
R10
10k
S1
SW PUSHBUTTON
B6
Speaker
AOUT SPEAKER
J1
DB9-RS232_1
CD(o)
1
RXD(o)
2
TXD(i)
3
DTR(i)
4
SG
5
DSR(o)
6
RTS(i)
7
CTS(o)
8
RD(o)
9
M2
11
M1
10
J2
RCA JACK
NI
R27 0
JP4
HEADER 5X2
1 2
3 4
5 6
7 8
9 10
R28
10k
JP9
JP8
U9
CS
1
SDO
2
SDI
5
HOLD
7
SCLK
6
WP
3
VCC
8
TP8
B3 PowerBlock
V1
V2
USB_+5
RESET
RJ11
1
2
3
4
5
6
7
8
9
10
11
12
JP10 JP12
Figure 13. Motherboard Top-level Schematic