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參數(shù)資料
| 型號： | 78Q2133R/F |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/38頁 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 MDIX 3.3V IND 32-QFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | PHY 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 4/4 |
| 規(guī)程： | IEEE 802 |
| 電源電壓： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 帶卷 (TR) |
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DS_21x3_001
78Q2123/78Q2133 Data Sheet
Rev. 1.6
19
prohibited, CRS responds to receive activity only and, in
10Base-T mode, the SQE test function is disabled.
16.14
INPOL
R/W
0
When this bit is ‘0’, the INTR pin is forced low to signal an
interrupt. Setting this bit to ‘1’ causes the INTR pin to be
forced high to signal an interrupt.
16.13
RSVD
R
0
Reserved
16.12
TXHIM
R/W
0
Transmitter High-Impedance Mode: When set, the
TXOP/TXON transmit pins and the TX_CLK pin are put into a
high-impedance state. The receive circuitry remains fully
functional.
16.11
SQEI
R/W
0
SQE Test Inhibit: Setting this bit to ‘1’ disables 10Base-T
SQE testing. By default, this bit is ‘0’ and the SQE test is
performed by generating a COL pulse following the
completion of a packet transmission.
16.10
NL10
R/W
0
10Base-T Natural Loopback: Setting this bit to ‘1’ causes
transmit data received on the TXD0-3 pins to be automatically
looped back to the RXD0-3 pins when 10Base-T mode is
enabled.
16.9
RSVD
R
0
Reserved
16.8
RSVD
R
1
Reserved
16.7
RSVD
R
0
Reserved
16.6
RSVD
R
1
Reserved
16.5
APOL
R/W
0
Auto Polarity: During auto-negotiation and 10BASE-T mode,
the 78Q2123/78Q2133 are able to automatically invert the
received signal due to a wrong polarity connection. It does so
by detecting the polarity of the link pulses. Setting this bit to
‘1’ disables this feature.
16.4
RVSPOL
R/W
0
Reverse Polarity: The reverse polarity is detected either
through 8 inverted 10Base-T link pulses (NLP) or through one
burst of inverted clock pulses in the auto-negotiation link
pulses (FLP). When the reverse polarity is detected and if the
Auto Polarity feature is enabled, the 78Q2123/78Q2133 will
invert the receive data input and set this bit to ‘1’. If Auto
Polarity is disabled, then this bit is writeable. Writing a ‘1’ to
this bit forces the polarity of the receive signal to be reversed.
16.3:2
RSVD
R/W
0h
Reserved: Must set to ‘00’.
16.1
PCSBP
R/W
0
PCS Bypass Mode: When set, the 100Base-TX PCS and
scrambling/ descrambling functions are bypassed. Scrambled
5-bit code groups for transmission are applied to the TX_ER,
TXD3-0 pins and received on the RX_ER, RXD3-0 pins. The
RX_DV and TX_EN signals are not valid in this mode.
PCSBP mode is valid only when 100Base-TX mode is
enabled and auto-negotiation is disabled.
16.0
RXCC
R/W
0
Receive Clock Control: This function is valid only in 100Base-
TX mode. When set to ‘1’, the RX_CLK signal will be held low
when there is no data being received (to save power). The
RX_CLK signal will restart 1 clock cycle before the assertion
of RX_DV and will be shut off 64 clock cycles after RX_DV
goes low. RXCC is disabled when loopback mode is enabled
(MR0.14 is high). This bit should be kept at logic zero when
PCS Bypass mode is used.
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