23 CARD INTERFACE (CARD)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
23-1
Card Interface (CARD)
23
CARD Module Overview
23.1
The S1C33L26 includes a card interface (CARD) module to connect a NAND Flash or SmartMedia cards.
The following shows the features of the CARD module:
• Generates the #NAND_RD and #NAND_WR signals.
(Use general-purpose input/output ports to control the signals specific to NAND Flash or SmartMedia card.)
• Supports 8-bit and 16-bit NAND Flash devices and SmartMedia cards.
• A NAND Flash or SmartMedia cards can be connected to the #CE9 area (Area 9 or Area 22).
• The data and address signals of the device can be connected directly to the external bus of the SRAMC.
CARD Output Pins
23.2
Table 23.2.1 lists the card interface output pins.
2.1 List of Card Interface Pins
Table 23.
Pin name
I/O
Qty
Function
#NAND_RD
O
1
SmartMedia read signal output pin
This pin outputs the read signal for NAND Flash and SmartMedia card.
#NAND_WR
O
1
SmartMedia write signal output pin
This pin outputs the write signal for NAND Flash and SmartMedia card.
The CARD output pins (#NAND_RD, #NAND_WR) are shared with I/O ports and are initially set as general pur-
pose I/O port pins. The pin functions must be switched using the port function select bits to use the general purpose
I/O port pins as CARD output pins. For detailed information on pin function switching, see the “I/O Ports (GPIO)”
chapter.
Card Interface Control Signals
23.3
Figure 23.3.1 shows the logic used to generate SmartMedia interface signals. Figure 23.3.2 shows an example of
connecting the S1C33L26 and a SmartMedia card (NAND Flash).
#RD
#CE9
#WR
#NAND_RD
#NAND_WR
3.1 Card Interface Signal Generation Circuit
Figure 23.
S1C33L26
SmartMedia card
(NAND Flash)
D[15:0]
or D[7:0]
#CE
#RE
#WE
CLE
ALE
RY/#BY
#WP
#CE9
#NAND_RD
#NAND_WR
(Software control) P
**
I/O[15:0] (16-bit Flash)
or I/O[7:0] (8-bit Flash)
3.2 Example of Connecting a SmartMedia Card
Figure 23.