<s>
General-Purpose	B-Protocol
Serial	I-Protocol
Interface	I-Protocol
,	O
also	O
known	O
as	O
GPSI	O
,	O
7-wire	O
interface	O
,	O
or	O
7WS	O
,	O
is	O
a	O
7	O
wire	O
communications	O
interface	O
.	O
</s>
<s>
It	O
is	O
used	O
as	O
an	O
interface	O
between	O
Ethernet	O
MAC	B-Protocol
and	O
PHY	O
blocks	O
.	O
</s>
<s>
+	O
GPSI	O
signals	O
Signal	O
name	O
Direction	O
Description	O
TXD	O
MAC	B-Protocol
>	O
PHY	O
Transmit	O
Data	O
(	O
driven	O
on	O
rising	O
edge	O
of	O
TXCLK	O
)	O
TXEN	O
MAC	B-Protocol
>	O
PHY	O
Transmit	O
Data	O
Enable	O
(	O
indicates	O
valid	O
TXD	O
)	O
...	O
etc	O
.	O
</s>
