參數(shù)資料
型號： MC92604ZT
廠商： Freescale Semiconductor
文件頁數(shù)： 50/122頁
文件大?。?/td> 0K
描述： IC TXRX ETH DUAL GIG 196-MAPBGA
標準包裝： 630
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 2/2
規(guī)程： 千兆位以太網(wǎng)
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 196-LBGA
供應(yīng)商設(shè)備封裝： 196-MAPBGA（15x15）
包裝： 托盤
Transmitter
MC92604 Dual Gigabit Ethernet Transceiver Reference Manual, Rev. 1
Freescale Semiconductor
2-11
/S/ Ordered_set to indicate Start_of_Frame. The MC92604 will support shorter preambles. The minimum
preamble size is a single 0x55 code group followed by a 0xD5 code group.
If XMIT_x_ERR is also raised when XMIT_x_ENABLE is raised, then a false carrier is declared, and a
void code groups (/V/) is transmitted.
If XMIT_x_ERR is raised after XMIT_x_ENABLE has been raised and while data is being transferred,
this is a request to transmit an error propagation Ordered_set (/V/) for as many code groups as long as
XMIT_x_ERR remains high.
When a normal End_of_Packet is detected (XMIT_x_ENABLE transitions to low and XMIT_x_ERR
remains low), a single End_of_Packet ordered_set (/T/) is transmitted followed by at least one
Carrier_Extend (/R/) ordered_set. A second Carrier_Extend will be inserted (if necessary) to complete an
even/odd pair. This is then followed by IDLE ordered_sets to indicate the inter-packet gap. The first /I/
may be either an /I1/ or /I2/, depending on running disparity.
If XMIT_x_ERR transitions to high as XMIT_x_ENABLE transitions to low, this is defined as a ‘carrier
extension.’ The ‘carrier extension’ state is a half-duplex feature and is not supported in the MC92604.
XMIT_x_ERR will be ignored while XMIT_x_ENABLE is low.
Transmitting in the Ethernet-compatability mode with the reduced (RGMII) interface is shown in
Table 2-8. The transmitter functional operation is the same as discussed above, except the data is entered
on both edges of the transmitter input clock, XMIT_x_CLK.
The 8 bits of uncoded data are entered with the least significant 4 bits on the rising clock and the most
significant bits on the falling clock edge.
2.5.2
Transmitting Coded Data—TBI or RTBI Modes
The PMA sublayer of the 1000BASE-X specification does not require any functional differences in the
transmitter from that used in the backplane application mode. Therefore, when operating in a mode
specified when the TBIE input is high, the state of the COMPAT input does not affect the transmitter’s
Table 2-8. Transmitter Inputs for RGMII Operating Mode
Data on Rising Edge of XMIT_x_CLK
Data on Falling Edge of XMIT_x_CLK
MC92604 Signal Name
GMII_TX_EN
GMII_TX_EN (XOR) GMII_TX_ER
XMIT_x_ENABLE
Data bits 3–0
Data bits 7–4
XMIT_x_3/XMIT_x_0
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