20-101-1051 Datasheet, PDF (38/165 Pages) List of Unclassifed Manufacturers – C-Programmable Core Module with NAND Flash Mass Storage and Ethernet

Table 2. RCM3365/RCM3375 Pinout Configurations (continued)
Pin
20
21
22
23
24
25
26–27
28
29
Pin Name
PG7
PG6
PG5
PG4
/IOWR
/IORD
SMODE0,
SMODE1
/RESET_IN
VRAM
Default Use
Alternate Use
Input/Output
RXE
Input/Output
TXE
Input/Output
RCLKE
Input/Output
TCLKE
Output
Output
(0,0)—start executing at address zero
(0,1)—cold boot from slave port
(1,0)—cold boot from clocked Serial Port A
SMODE0 =1, SMODE1 = 1
Cold boot from asynchronous Serial Port A at
2400 bps (programming cable connected)
Input
Output
30
VBAT_EXT 3 V battery Input
31
+3.3 VIN
Power Input
32
GND
33
n.c.
34
GND
Notes
Serial Port E
Serial Clock E input
Serial Clock E ouput
External write strobe
External read strobe
Also connected to
programming cable
Input to Reset Generator
See Notes below table
Minimum battery
voltage 2.85 V
3.15–3.45 V DC
Reserved for future use
Notes
1. When using pins 33–34 on header J3 to drive LEDs, these pins can handle a sinking
current of up to 8 mA.
2. The VRAM voltage is temperature-dependent. If the VRAM voltage drops below about
1.2 V to 1.5 V, the contents of the battery-backed SRAM may be lost. If VRAM drops
below 1.0 V, the 32 kHz oscillator could stop running. Pay careful attention to this volt-
age if you draw any current from this pin.
3. Do not overload the /IOWR line because the NAND flash memories have critical
timing requirements. In some cases it may be necessary to buffer /IOWR on the
motherboard.
32
RabbitCore RCM3365/RCM3375