cs8952t Cirrus Logic, Inc., cs8952t Datasheet - Page 53
cs8952t
Manufacturer Part Number
cs8952t
Description
100base 10base-t Transceiver
Manufacturer
Cirrus Logic, Inc.
Datasheet
1.CS8952T.pdf
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PCS Sub-Layer Configuration Register - Address 17h (Cont.)
DS206TPP2
9
8
7
6
5
4
CS8952T
CrystalLAN™ 100BASE-X and 10BASE-T Transceiver
BIT
MF Preamble
Enable
Fast Test
CLK25 Disable
Enable LT/100
CIM Disable
Tx Disable
NAME
Read/Write 0
Read/Write 0
Read/Write When TCM pin is
Read/Write 1
Read/Write Reset to the logic
Read/Write 0
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
TYPE
low, reset to 1; oth-
erwise, reset to 0
inverse of the
value on the
REPEATER pin.
RESET
When set, this bit will force all management frames
(via MDIO, MDC) to be preceded by a 32 bit pream-
ble pattern of contiguous ones to be considered valid.
When cleared, it allows management frames with or
without the preamble pattern. The status of this regis-
ter is (inversely) reflected in the MF Preamble bit in
the Basic Mode Status Register (address 01h).
Note: This bit is disabled, and writes to this bit are
ignored when the National Compatibility Mode bit of
the 10BASE-T Configuration Register (address 1Ch)
is set.
When set, internal timers are sped up significantly in
order to facilitate production test. Leave clear for
proper operation.
Note: This bit is disabled, and writes to this bit are
ignored when the National Compatibility Mode bit of
the 10BASE-T Configuration Register (address 1Ch)
is set.
Setting this bit will disable (tri-state) the CLK25 output
pin, reducing digital noise and power consumption.
When set, normal link status checking is enabled.
When clear, this bit forces the link status to Link OK
(at 100 Mb/s), and will assert the LINK_OK LED.
When set, this bit forces the Carrier Integrity Monitor
function to be disabled. When low, the Carrier Integ-
rity Monitor function is enabled, and detection of an
unstable link will disable the receive and transmit
functions.
When set, this bit forces the 10 Mb/s and 100 Mb/s
outputs to be inactive. When clear, normal transmis-
sion is enabled.
If Tx Disable is set while a packet is being transmit-
ted, transmission is completed and no subsequent
packets are transmitted until Tx Disable is cleared
again. Also, if Tx Disable is cleared while TX_EN is
high, the transmitter will remain disabled until TX_EN
is deasserted. This prevents fragments from being
transmitted onto the network.
DESCRIPTION
53
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