参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 23/148页
文件大小: 1733K
代理商: PC87393F-VJG
7.0 X-Bus Extension (Continued)
119
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XA3-0
HA3-0
XD7-0
HA11-4
XA18-12
HA18-12
XSTB0
FXASTB
XRDY
HIOCHRDY
PIRQA-D
IRQ11, IRQ8, IRQ12, and IRQ1 respectively
GND
HMEMCS
If any of the functions multiplexed on XA18-12 (Game Port or Serial Port 2) are needed, use an external latch for these
signals.
Use the XRDY signal that is enabled upon reset. Either of the XIORD and XIOWR signals may be used. Set proper sys-
tem configuration before accessing a PC87570 or any I/O device with separate read and write signals for I/O and mem-
ory transactions.
2. Bear in mind the following system design hints for asynchronous X-Bus use:
q
The chip select signal should be used as a qualier with the address when partial address decoding is in use for mul-
tiple device access control.
q
In read cycles, the system may drive the data until the read signal XRD is de-asserted to guarantee the proper
PC8739x sampling.
q
In write cycles, use either the falling or rising edge of the write control signal (XWR) to latch the data in the device.
3. Address multiplexing on XDT7-0 and the XSTB2-0 is designed for glueless interface with off-chip latch components. See
the example using 74HCT373 latches in Figure 29.
Figure 29. Latched Mode X-Bus Transactions External Logic
(74HCT373)
D7-0
A27-20
A19-12
A3-0
XA3-0
XDT7-0
A11-4
Latch
(74HCT373)
Latch
(74HCT373)
Latch
XSTB0
XSTB1
XSTB2
PC8739
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