Texas Instruments THUNDERSWITCH II TNETX4090 - Manual (Page 11)

TNETX4090
ThunderSWITCH II

9-PORT 100-/1000-MBIT/S ETHERNET

SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
11
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
Terminal Functions (Continued)
100-/1000-Mbit/s MAC interface [media-independent interface (MII) mode] (continued)
TERMINAL
NAME
I/O
INTERNAL
RESISTOR
DESCRIPTION
M08_TXEN O None
Transmit enable. M08_TXEN indicates valid transmit data on M08_TXD3–M08_TXD0. This signal
is synchronous to M08_RFCLK.
M08_TXER O None
Transmit error. M08_TXER allows coding errors to be propagated between the MAC and the
attached PHY. It is asserted at the end of an under-running frame, enabling the device to force a
coding error.
10-/100-Mbit/s MAC interface (MII mode) (ports 0–7)
TERMINAL
I/O
INTERNAL
DESCRIPTION
NAME NO.
I/O
RESISTOR
DESCRIPTION
M00_COL
M01_COL
M02_COL
M03_COL
M04_COL
M05_COL
M06_COL
M07_COL C21
D16
C11
A6
H2
N2
V1
AC6
I Pulldown
Collision sense. Assertion of Mxx_COL indicates network collision. In full-duplex mode, the
port does not start transmitting a new frame if this signal is active; the value of this terminal
is ignored at all other times.
M00_CRS
M01_CRS
M02_CRS
M03_CRS
M04_CRS
M05_CRS
M06_CRS
M07_CRS B21
C16
B11
B6
H1
P3
W3
AD6
I Pulldown Carrier sense. Indicates a frame-carrier signal is being received.
M00_LINK
M01_LINK
M02_LINK
M03_LINK
M04_LINK
M05_LINK
M06_LINK
M07_LINK B19
B14
A9
A4
L3
T2
AA1
AF3
I Pulldown
Connection status. Indicates the presence of port connection:
– If Mxx_LINK = 0, there is no link.
– If Mxx_LINK = 1, the link is OK.
An internal pullup resistor is provided.
M00_RCLK
M01_RCLK
M02_RCLK
M03_RCLK
M04_RCLK
M05_RCLK
M06_RCLK
M07_RCLK A21
B16
A11
C6
J3
P2
W2
AE6
I Pullup Receive clock. Receive clock source from the attached PHY device.