
C-Port Confidential
Preliminary Version — January 21, 2002
Pin Descriptions Grouped by Function
29
Gigabit Ethernet and Fibre Channel TBI Configuration
1000BASE-T Gigabit Ethernet and Fibre Channel TBI is implemented in much the same
way as Gigabit Ethernet (GMII).
Table 7 shows the possible CP pin combinations you can
use and
Figure 3 shows receive and transmit pin configurations by cluster.
Table 9 shows
the signals and pinouts for a single cluster for Gigabit Ethernet and Fibre Channel TBI.
CPn+1_6
LVTTL
O
TX_ER
Transmit Error. Asserting TX_ER when TX_EN is a 1 causes
transmission of the designated “bad code” in lieu of the normal
encoded data on the twisted pair data.
CPn+2_0
nc
CPn+2_1
LVTTL
I
RCLK
Receive Clock (125MHz)
CPn+2_2
LVTTL
I
RXD(0)
Receive Data (byte-wide receive data, least significant bit)
CPn+2_3
LVTTL
I
RXD(1)
Receive Data
CPn+2_4
LVTTL
I
RXD(2)
Receive Data
CPn+2_5
LVTTL
I
RXD(3)
Receive Data
CPn+2_6
LVTTL
I
RX_DV
Receive Data Valid. Indicates that there is a receive frame in progress
and that the data present on the RXD signals is valid.
CPn+3_0
nc
CPn+3_1
LVTTL
I
CRS
Carrier Sense. Indicates traffic is on the link. CRS is asserted when a
non-idle condition is detected on the receive data stream. CRS is
deasserted when an end of frame or idle condition is detected.
CPn+3_2
LVTTL
I
RXD(4)
Receive Data
CPn+3_3
LVTTL
I
RXD(5)
Receive Data
CPn+3_4
LVTTL
I
RXD(6)
Receive Data
CPn+3_5
LVTTL
I
RXD(7)
Receive Data (most significant bit)
CPn+3_6
LVTTL
I
RX_ER
Receive Error Detected. Indicates that there has been an error
received in the receive frame.
Total Pins
28
* n can be 0, 4, 8, or 12.
Reference Table 4 for pin numbers for the actual cluster(s) you are configuring. Table 8 Gigabit Ethernet (GMII/MII) Signals One Cluster Example (continued)
Signal Name* Pin # Total
Type
I/O
Label
Signal Description