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| 型號(hào)： | 20575 |
| 英文描述： | Wireless LAN DSSS PC Card Reference Design Application ? 220KB (PDF) |
| 中文描述： | 無(wú)線局域網(wǎng)擴(kuò)頻PC卡參考設(shè)計(jì)中的應(yīng)用？欺詐郵件（PDF格式） |
| 文件頁(yè)數(shù)： | 25/25頁(yè) |
| 文件大小： | 220K |
| 代理商： | 20575 |
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all implementations that use a 32.768 kHz crystal. For
any system implementation in which any other value of
crystal is used, this routine needs to be modified to
accommodate the difference in crystal frequency.
pgm_clkgt20()
This routine sets the CLKGT20 bit of the MIR9 register,
since the 80188 microcontroller inside of the
Am79C930 device must be running at 20 MHz
(Am79C930 CLKIN pin = 40 MHz) in order to support
the MIPS requirement of the IEEE 802.11 MAC protocol
firmware. This routine may set the CLKGT20 bit of MIR9
to zero only if non-IEEE 802.11 MAC protocol firmware
is operating and the Am79C930 CLKIN input pin is run-
ning at a frequency of 20 MHz or less.
set_wait_states()
This routine sets the number of wait states to be intro-
duced for SRAM and FLASH memory accesses by al-
tering the contents of the MIR8 and MIR9 registers of
the Am79C930 device. With the Am79C930 CLKIN in-
put running at 40 MHz, memory devices that require a
setting of greater than one wait state will cause improper
function. Memory devices that allow wait state settings
of less than one are allowed for either SRAM or FLASH.
Trademarks
Copyright 1997 Advanced Micro Devices, Inc. All rights reserved.
AMD, the AMD logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
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