參數(shù)資料
型號(hào): AM79C970
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述: PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁(yè)數(shù): 57/168頁(yè)
文件大?。?/td> 943K
代理商: AM79C970
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AMD
P R E L I M I N A R Y
1-924
Am79C970
difference between BCC and phase-locked clock.
Hence, input data jitter is reduced in ISRDCLK by
10to1.
Carrier Tracking and End of Message
The carrier detection circuit monitors the DI
±
inputs after
IRXCRS is asserted for an end of message. IRXCRS
de-asserts 1 to 2 bit times after the last positive transi-
tion on the incoming message. This initiates the end of
reception cycle. The time delay from the last rising edge
of the message to IRXCRS de-assert allows the last bit
to be strobed by ISRDCLK and transferred to the con-
troller section, but prevents any extra bit(s) at the end
ofmessage.
Data Decoding
The data receiver is a comparator with clocked output to
minimize noise sensitivity to the DI
±
inputs. Input error is
less than
±
35 mV to minimize sensitivity to input rise and
fall time. ISRDCLK strobes the data receiver output at
1/4 bit time to determine the value of the Manchester bit,
and clocks the data out on IRXDAT on the following
ISRDCLK. The data receiver also generates the signal
used for phase detector comparison to the internal
MENDEC voltage controlled oscillator (VCO).
Differential Input Terminations
The differential input for the Manchester data (DI
±
) is
externally terminated by two 40.2
±
1% resistors and
one optional common-mode bypass capacitor, as
shown in the Differential Input Termination diagram be-
low. The differential input impedance, Z
IDF
, and the com-
mon-mode input impedance, Z
ICM
, are specified so that
the Ethernet specification for cable termination imped-
ance is met using standard 1% resistor terminators. If
SIP devices are used, 39
is also a suitable value. The
CI
±
differential inputs are terminated in exactly the same
way as the DI
±
pair.
PCnet-PCI
DI+
DI-
40.2
40.2
0.01
μ
F
to
0.1
μ
F
AUI Isolation
Transformer
18220C-27
Figure 25.
Differential Input Termination
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
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