Toshiba TLCS-900/H1 Series Manual page 444

Port Function
NAND P71 Output
NDRE
flash
P72 Output
NDWE
P75 NDR/ B
P84 Output
ND 0 CE
PJ5 NDALE Output
PJ6 NDCLE Output
−
D7 to D0
UART PF0 TXD1 Output
PF1 RXD1
− D +
USB
− D −
PC6 PUCTL Output
Note 1: When booting method is either NAND flash or UART and USB is used in the system,
ensure the D + pin pull-up resistor is not on in the BOOT mode.
Note 2: When booting method is USB, do not start UART application software on the PC.
Note 3: When booting method is UART, do not connect the USB connector.
Table 3.21.4 How to Design PCB
I/O
NAND flash
Connect to NAND flash and
pull-up by 100 kΩ resistor
because this pin is changed to
input port by reset.
Input Connect to NAND flash and
pull-up by 2 kΩ resistor
because R/B pin of NAND
flash has open-drain output
buffer.
Connect to NAND flash.
I/O
Not affected by NAND flash
boot.
Input
I/O Not affected NAND flash boot. Not affected by UART boot.
I/O
92CH21-442
Boot Method
UART
Not affected by UART boot.
If the NAND flash is not used in
the system, ensure no conflict
with the I/O direction shown
left.
Connect to level shifter.
TMP92CH21
USB
Not affected by USB boot.
If the NAND flash is not used
in the system, ensure no
conflict with the I/O direction
shown left.
Not affected by USB boot.
Pull-up by 100 kΩ to avoid
UART executing.
Connect to USB connector,
add dumping resistor (27Ω)
and 1.5 kΩ pull-up which can
be switched ON/OFF.
Connect to USB connector
and add dumping resistor
(27Ω).
Used to control ON/OFF
pull-up resistor of D + pin. The
switch should be ON by "1".
As this pin changes to input
port by reset, add100 kΩ
pull-down.
2009-06-19