r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 449

Manufacturer Part Number

r5s77631ay266bgv

Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series

Manufacturer

Renesas Electronics Corporation.

Figures 11.18 and 11.19 show the timing for the PCMCIA I/O card interface.

When accessing a PCMCIA card via the I/O card interface, it is possible to perform dynamic

sizing of the I/O bus width using the IOIS16 pin. With the 16-bit bus width selected, if the IOIS16

signal is high during the word-size I/O bus cycle, the I/O port is recognized as eight bits in bus

width. In this case, a data access for only eight bits is performed in the I/O bus cycle being

executed, and this is automatically followed by a data access for the remaining eight bits. Dynamic

bus sizing is also performed for byte-size access to address 2n + 1.

Figure 11.20 shows the basic timing for dynamic bus sizing.

I/O Card Interface Timing

PCC_REG (WE0)

DA: Dual address DMA

Figure 11.18 Basic Timing for PCMCIA I/O Card Interface

Section 11 Local Bus State Controller (LBSC)

Rev. 1.00 Oct. 01, 2007 Page 383 of 1956

REJ09B0256-0100