參數資料
型號: KMPC875ZT80
廠商: Freescale Semiconductor
文件頁數: 64/84頁
文件大小: 0K
描述: IC MPU POWERQUICC 80MHZ 256PBGA
標準包裝: 2
系列: MPC8xx
處理器類型: 32-位 MPC8xx PowerQUICC
速度: 80MHz
電壓: 3.3V
安裝類型: 表面貼裝
封裝/外殼: 256-BGA
供應商設備封裝: 256-PBGA(23x23)
包裝: 托盤
MPC875/MPC870 PowerQUICC Hardware Specifications, Rev. 4
Freescale Semiconductor
67
USB Electrical Characteristics
14 USB Electrical Characteristics
This section provides the AC timings for the USB interface.
14.1
USB Interface AC Timing Specifications
The USB Port uses the transmit clock on SCC1. Table 30 lists the USB interface timings.
15 FEC Electrical Characteristics
This section provides the AC electrical specifications for the Fast Ethernet controller (FEC). Note that the
timing specifications for the MII signals are independent of system clock frequency (part speed
designation). Also, MII signals use TTL signal levels compatible with devices operating at either 5.0 or
3.3 V.
15.1
MII and Reduced MII Receive Signal Timing
The receiver functions correctly up to a MII_RX_CLK maximum frequency of 25 MHz + 1%. The
reduced MII (RMII) receiver functions correctly up to a RMII_REFCLK maximum frequency of 50 MHz
+ 1%. There is no minimum frequency requirement. In addition, the processor clock frequency must
exceed the MII_RX_CLK frequency – 1%.
Table 31 provides information on the MII receive signal timing.
Table 30. USB Interface AC Timing Specifications
Name
Characteristic
All Frequencies
Unit
Min
Max
US1
USBCLK frequency of operation1
Low speed
Full speed
1 USBCLK accuracy should be ±500 ppm or better. USBCLK may be stopped to conserve power.
6
48
MHz
US4
USBCLK duty cycle (measured at 1.5 V)
45
55
%
Table 31. MII Receive Signal Timing
Num
Characteristic
Min
Max
Unit
M1
MII_RXD[3:0], MII_RX_DV, MII_RX_ER to MII_RX_CLK setup
5
ns
M2
MII_RX_CLK to MII_RXD[3:0], MII_RX_DV, MII_RX_ER hold
5
ns
M3
MII_RX_CLK pulse width high
35%
65%
MII_RX_CLK period
M4
MII_RX_CLK pulse width low
35%
65%
MII_RX_CLK period
M1_RMII
RMII_RXD[1:0], RMII_CRS_DV, RMII_RX_ERR to RMII_REFCLK
setup
4—
ns
M2_RMII
RMII_REFCLK to RMII_RXD[1:0], RMII_CRS_DV, RMII_RX_ERR
hold
2—
ns
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