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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 138/265頁(yè) |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971KCW |
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138
Am79C971
The default value of this register
is 0000b. This corresponds to a
polling interval of 65,536 clock
periods
(1.966
CLK = 33 MHz). The TXPOL-
LINT value of 0000b is created
during the microcode initialization
routine and, therefore, might not
be seen when reading CSR47 af-
ter H_RESET or S_RESET.
ms
when
If the user desires to program a
value for POLLINT other than the
default, then the correct proce-
dure is to first set INIT only in
CSR0. Then, when the initializa-
tion sequence is complete, the
user must set STOP (CSR0, bit
2). Then the user may write to
CSR47 and then set STRT in
CSR0. In this way, the default
value of 0000h in CSR47 will be
overwritten with the desired user
value.
If the user does
not
use the stan-
dard
initialization
(standard implies use of an initial-
ization block in memory and set-
ting the INIT bit of CSR0), but
instead, chooses to write directly
to each of the registers that are
involved in the INIT operation,
then it is imperative that the user
also writes all zeros to CSR47 as
part of the alternative initialization
sequence.
procedure
Read/Write accessible only when
either the STOP or the SPND bit
is set. These bits are unaffected
by H_RESET, S_RESET, or
STOP.
CSR48: Receive Poll Time Counter
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
RXPOLL
Receive Poll Time Counter. This
counter is incremented by the
Am79C971 controller microcode
and is used to trigger the receive
descriptor ring polling operation
of the Am79C971 controller.
Read/Write accessible only when
either the STOP or the SPND bit
is set. These bits are unaffected
by H_RESET, S_RESET, or
STOP.
CSR49: Receive Polling Interval
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
RXPOLLINT Receive Polling Interval. This reg-
ister contains the time that the
Am79C971 controller will wait be-
tween successive polling opera-
tions. The RXPOLLINT value is
expressed as the two
’
s comple-
ment of the desired interval,
where each bit of RXPOLLINT
approximately represents one
clock
time
LINT[3:0] are ignored. (RXPOL-
LINT[16] is implied to be a 1, so
RXPOLLINT[15] is significant
and does not represent the sign
of the two
’
s complement RXPOL-
LINT value.)
period.
RXPOL-
The default value of this register
is 0000h. This corresponds to a
polling interval of 65,536 clock
periods
(1.966
CLK = 33 MHz). The RXPOL-
LINT value of 0000h is created
during the microcode initialization
routine and, therefore, might not
be seen when reading CSR49 af-
ter H_RESET or S_RESET.
ms
when
If the user desires to program a
value for RXPOLLINT other than
the default, then the correct pro-
cedure is to first set INIT only in
CSR0. Then, when the initializa-
tion sequence is complete, the
user must set STOP (CSR0, bit
2). Then the user may write to
CSR49 and then set STRT in
CSR0. In this way, the default
value of 0000h in CSR47 will be
overwritten with the desired user
value.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C972BKCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BVCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972 | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BVIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C971VCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| AM79C972 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
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