Table 6-5. 4450 GMII/TBI pin descriptions - PHY mode (Host Only) (Sheet 2 of 2)
Pin Name
GMII/TBI Signal
GMII: tx_dv
I/O
Description
hx_bus1[8]
in
In GMII mode, valid transmit data driven
high by remote device on TX_DAT bus.
TBI: tx_dat[8]
In TBI mode, additional transmit output.
Used with other TX_DAT outputs to form ten
bit bus TX_DAT[9:0].
hx_bus1[7:0]
hx_bus0[9]
tx_dat[7:0]
in
Transmit data for GbE. Only TX_DAT[3:0]
used for 10/100FE(MII mode.
GMII: tx_er
out
In GMII mode, asserted high by the PHY if a
media error is detected.
TBI: tx_dat[9]
In TBI mode, additional receive input. Used
with other RX_DAT inputs to form ten bit bus
RX_DAT[9:0].
xhx_bus0[8]
GMII: rx_dv
out
out
In GMII mode, receive data valid: driven
high by PHY to indicate valid recovered data
on RX_DAT bus.
TBI: rx_dat[8]
In TBI mode, additional receive input. Used
with other RX_DAT inputs to form ten bit bus
RX_DAT[9:0].
hx_bus0[7:0]
rx_dat[7:0]
Receive data for GbE. Only RX_DAT[3:0]
used for 10/100FE(MII mode.
Note
hx = h0 or h1
6.2.2
Host GMAC RGMII/RTBI Interface Usage
This section discusses the use of GMAC interfaces for the host side interfaces h0 or h1
when configured to support operation in RGMII or RTBI modes.
6.2.2.1
Host GMAC RGMII/RTBI Pin Mappings
Table 6-6. 4450 RGMII/RTBI MAC/PHY modes Host pin mappings
Pin Name
MAC-RGMII
RGMII Signal
hx_rxc
MAC-RTBI
PHY-RGMII
RGMII Signal
hx_txc
PHY-RTBI
RTBI Signal
hx_txc
I/O
in
RTBI Signal I/O
I/O
in
I/O
in
hx_clk_1
hx_rxc
in
hx_bus1[4]
hx_bus1[3:0]
hx_clk_0
hx_rx_ctl
in
hx_rxd[4]
hx_rxd[3:0]
hx_txc
in
hx_tx_ctl
in
hx_txd[4]
hx_txd[3:0]
hx_rxc
in
hx_rxd[3:0]
hx_txc
in
in
hx_txd[3:0]
hx_rxc
in
in
out
out
out
out
out
out
out
out
out
out
out
out
hx_bus0[4]
hx_bus0[3:0]
hx_tx_ctl
hx_txd[4]
hx_txd[3:0]
hx_rx_ctl
hx_rxd[3:0]
hx_rxd[4]
hx_rxd[3:0]
hx_txd[3:0]
Note
1. hx = h0 or h1
Table 6-12 provides the functional signal names and mapping for the Host ports if it is
desired to run in SERDES mode.
4450 – Data Sheet, DS-0131-06
Page39
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