HBLXT9785HE.D0 Intel, HBLXT9785HE.D0 Datasheet - Page 91
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HBLXT9785HE.D0
Manufacturer Part Number
HBLXT9785HE.D0
Description
Manufacturer
Intel
Datasheet
1.HBLXT9785HE.D0.pdf
(221 pages)
Specifications of HBLXT9785HE.D0
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LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
Table 32
Cortina Systems
Miscellaneous Signal Descriptions – BGA23 (Sheet 4 of 4)
®
1. Type Column Coding: I = Input, O = Output, OD = Open Drain Output, ST = Schmitt Triggered Input, TS =
2. The IP/ID resistors are disabled during hardware power-down mode.
3. The LINKHOLD ability is available only for stepping 4 (Revision D0).
BGA23
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
A15
A12
A17
D7
Designation
Three-State-able Output, SL = Slew-rate Limited Output, IP = Weak Internal Pull-Up, ID = Weak Internal
Pull-Down.
Ball/Pin
PQFP
11
20
40
2
LINKHOLD
FIFOSEL1
FIFOSEL0
PREASEL
Symbol
3
I, ID, ST
I, ID, ST
I, ID, ST
Type
1
Signal Description
FIFO Select <1:0>.
These pins are read at startup or reset. Their value at
that time is used to set the default state of Register bits
18.15:14 for all ports. These register bits can be read
and overwritten after startup/reset.
These pins are shared with RMII-RxER<5:4>. An
external pull-up resistor (see applications section for
value) can be used to set FIFO Select<1:0> to active
while RxER<5:4> are three-stated during hardware
reset. If no pull-up is used, the default FIFO select
state is set via the internal pull-down resistors.
See
page
Preamble Select.
This pin is read at startup or reset. Its value at that time
is used to set the default state of Register bit 16.5 for
all ports. This register bit can be read and overwritten
after startup/reset.
This pin is shared with RMII-RxER2. An external pull-
up resistor (see applications section for value) can be
used to set Preamble Select to active while RxER2 is
three-stated during hardware reset. If no pull-up is
used, the default Preamble Select state is set via the
internal pull-down resistors.
Note: Preamble select has no effect in 100 Mbps
operation.
LINKHOLD Default. This pin is read at startup or
reset. Its value at that time is used to set the default
state of Register bit 0.11 for all ports. This register bit
can be read and overwritten after startup / reset. When
High, the LXT9785/LXT9785E powers down all ports.
This pin is shared with RMII-RxER6. An external pull-
up resistor (see applications section for value) can be
used to set LINKHOLD active while RxER6 is tri-stated
during H/W reset. If no pull-up is used, the default
LINKHOLD state is set inactive via the internal pull-
down resistor.
Table 36, Receive FIFO Depth Configurations, on
96.
2
3.4 BGA23 Signal Descriptions
Page 91
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