參數(shù)資料
型號: AM79C971KCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE
中文描述: 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16
封裝: PLASTIC, QFP-160
文件頁數(shù): 176/265頁
文件大小: 3190K
代理商: AM79C971KCW
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176
Am79C971
P R E L I M I N A R Y
cess to EBDATA (BCR30). When
EBADDRL reaches FFFFh and
LAAINC is set to 1, the Expansion
Port Lower Address (EPADDRL)
will roll over to 0000h. When the
LAAINC bit is set to 0, the Expan-
sion Port Lower Address will not
be affected in any way after an
access to EBDATA (BCR30) and
must be programmed.
Read accessible always; write
accessible only when the STOP
bit is set. LAINC is 0 after
H_RESET and is unaffected by
S_RESET or the STOP bit.
13-4
RES
Reserved locations. Written as
zeros and read as undefined.
3-0
EPADDRU
Expansion Port Address Upper.
This upper portion of the Expan-
sion Bus address is used to pro-
vide addresses for Flash/EPROM
port accesses.
Read accessible always; write
accessible only when the STOP
bit is set or when SRAM SIZE
(BCR25, bits 7-0) is 0. EPADD-
RU is undefined after H_RESET
and is unaffected by S_RESET or
the STOP bit.
BCR30: Expansion Bus Data Port Register
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
EBDATA
Expansion Bus Data Port. EBDA-
TA is the data port for operations
on the Expansion Port accesses
involving SRAM and Flash ac-
cesses. The type of access is set
by the FLASH bit (BCR 29, bit
15). When the FLASH bit is set to
1, the Expansion Bus access will
follow the Flash access timing.
When the FLASH bit is set to 0,
the Expansion Bus access will
follow the SRAM access timing.
Note:
It is important to set the
FLASH bit and load Expansion
Port Address EPADDR (BCR28,
BCR29) with the required ad-
dress before attempting read or
write to the Expansion Bus data
port. The Flash and SRAM ac-
cesses use different address
phases. Incorrect configuration
will result in a possible corruption
of data.
Flash read cycles are performed
when BCR30 is read and the
FLASH bit (BCR29, bit 15) is set
to 1. Upon completion of the read
cycle, the 8-bit result for Flash ac-
cess is stored in EBDATA[7:0],
EBDATA[15:8]
Flash write cycles are performed
when BCR30 is written and the
FLASH bit (BCR29, bit 15) is set
to 1. EBDATA[7:0] only is valid
for write cycles.
is
undefined.
SRAM read cycles are performed
when BCR30 is read and the
FLASH bit (BCR29, bit 15) is set
to 0. Upon completion of the read
cycle, the 16-bit result for SRAM
access is stored in EBDATA.
Write cycles to the SRAM are in-
voked when BCR30 is written
and the FLASH bit (BCR29, bit
15) is set to 0. Byte writes to the
SRAM must use a read-modify-
write scheme since the word is al-
ways valid for SRAM write or
read accesses.
Read and write accessible only
when the STOP is set or when
SRAM SIZE (BCR25, bits 7-0) is
0. EBDATA is undefined after
H_RESET, and is unaffected by
S_RESET and the STOP bit.
BCR31: Software Timer Register
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
STVAL
Software Timer Value. STVAL
controls the maximum time for
the Software Timer to count be-
fore
generating
(CSR7, bit 11) interrupt. The Soft-
ware Timer is a free-running timer
that is started upon the first write
to STVAL. After the first write, the
Software Timer will continually
count and set the STINT interrupt
at the STVAL period.
the
STINT
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