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VSC8540RT 数据表(PDF) 71 Page - Microchip Technology

部件名 VSC8540RT
功能描述  Radiation-Tolerant Single Port Fast Ethernet Copper PHY with RGMII/MII/RMII Interfaces
PDF  87 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

VSC8540RT 数据表(HTML) 71 Page - Microchip Technology

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2022 Microchip Technology Inc. and its subsidiaries
DS60001603E-page 71
VSC8540RT
8.4.4
RMII_CLKOUT
This section provides the AC characteristics for the RMII_CLKOUT signal.
Note:
The RMII_CLKOUT signal is provided on the RX_CLK pin (see Table 5-3) when the device is operating in
RMII mode.
The following table shows the AC specifications for RMII_CLKOUT.
8.4.5
BASIC SERIAL LEDS
This section contains the AC specifications for the basic serial LEDs.
FIGURE 8-3:
BASIC SERIAL LED TIMING
8.4.6
RMII AC CHARACTERISTICS
The following table lists the characteristics when using the device in RMII mode.
TABLE 8-20:
RMII_CLKOUT AC CHARACTERISTICS
Parameter
Symbol
Minimum
Typical
Maximum
Unit
RMII_CLKOUT frequency
ƒ
50
MHz
RMII_CLKOUT duty cycle
DC
35
65
%
RMII_CLKOUT rise time
tR
1ns
RMII_CLKOUT fall time
tF
1ns
TABLE 8-21:
BASIC SERIAL LEDS AC CHARACTERISTICS
Parameter
Symbol
Typical
Unit
LED_CLK cycle time
tCYC
1024
ns
Pause between LED port sequences tPAUSE_PORT 3072
ns
Pause between LED bit sequences
tPAUSE_BIT
25.541632 ms
LED_CLK to LED_DATA
tCO
1ns
TABLE 8-22:
RMII AC CHARACTERISTICS
Parameter
Symbol Minimum Typical Maximum Unit
TXD[1:0], TX_EN data setup to RMII_-
CLKIN rising edge
TSU
4ns
TXD[1:0], TX_EN data hold from RMII_-
CLKIN rising edge
THOLD
2ns
RXD[1:0], CRS_DV, and RX_ER output
delay from RMII_CLKIN rising edge
TDELAY
13.5
ns
LED_CLK
LED_DATA
tCO
tCYC
tPAUSE_PORT
Bit 1
Bit X
Bit 1
Bit 2



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