Section 11 Local Bus State Controller (LBSC)
Rev.1.00 Dec. 13, 2005 Page 380 of 1286
REJ09B0158-0100
(2) I/O Card Interface Timing
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.
CLKOUT
T
pci1
T
pci2
A25 to A0
R/
W
CExx
IORD
(read)
D15 to D0
(read)
IOWR
(write)
D15 to D0
(write)
BS
DACK
REG
(
WE0
)
Figure 11.18 Basic Timing for PCMCIA I/O Card Interface
Содержание SH7780 Series
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