参数资料
型号: MCF5233CVM150
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 150 MHz, RISC PROCESSOR, PBGA256
封装: MAPBGA-256
文件页数: 63/76页
文件大小: 2665K
代理商: MCF5233CVM150
66
MCF523x Integrated Microprocessor Hardware Specifications
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Fast Ethernet AC Timing Specifications
Figure 19 shows MII receive signal timings listed in Table 53.
Figure 19. MII Receive Signal Timing Diagram
6.10.2 MII Transmit Signal Timing (ETXD[3:0], ETXEN,
ETXER, ETXCLK)
Table 54 lists MII transmit channel timings.
The transmitter functions correctly up to a ETXCLK maximum frequency of 25 MHz +1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed twice the
ETXCLK frequency.
The transmit outputs (ETXD[3:0], ETXEN, ETXER) can be programmed to transition from either the rising
or falling edge of ETXCLK, and the timing is the same in either case. This options allows the use of
non-compliant MII PHYs.
Refer to the Ethernet chapter for details of this option and how to enable it.
Table 53. MII Receive Signal Timing
Num
Characteristic
Min
Max
Unit
M1
ERXD[3:0], ERXDV, ERXER to ERXCLK setup
5
ns
M2
ERXCLK to ERXD[3:0], ERXDV, ERXER hold
5
ns
M3
ERXCLK pulse width high
35%
65%
ERXCLK period
M4
ERXCLK pulse width low
35%
65%
ERXCLK period
Table 54. MII Transmit Signal Timing
Num
Characteristic
Min
Max
Unit
M5
ETXCLK to ETXD[3:0], ETXEN, ETXER invalid
5
ns
M6
ETXCLK to ETXD[3:0], ETXEN, ETXER valid
25
ns
M7
ETXCLK pulse width high
35%
65%
ETXCLK period
M8
ETXCLK pulse width low
35%
65%
ETXCLK period
M1
M2
ERXCLK (input)
ERXD[3:0] (inputs)
ERXDV
ERXER
M3
M4
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