Intel IXF1104 Datasheet page 42

Table 3. SPI3 Interface Signal Descriptions (Sheet 4 of 8)
Signal Name
MPHY
DTPA_0
DTPA_1
DTPA_2
DTPA_3
STPA
Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
®
Intel IXF1104 4-Port Gigabit Ethernet Media Access Controller
Ball
Type
Designator
SPHY
DTPA_0 D3
DTPA_1 L1
Output
DTPA_2 A9
DTPA_3 J7
NA C11 Output
Standard Description
DTPA_0:3 Direct Transmit Packet
Available.
A direct status indication for transmit FIFOs
of ports 0:3.
When High, DTPA indicates that the amount
of data in the TX FIFO is below the TX FIFO
High watermark. When the High watermark
is crossed, DTPA transitions Low to indicate
that the TX FIFO is almost full. It stays Low
until the amount of data in the TX FIFO
goes back below the TX FIFO Low
watermark. At this point, DTPA transitions
3.3 V
High to indicate that the programmed
LVTTL
number of bytes are now available for data
transfers.
NOTE: For more information, see
Table 132 "TX FIFO High
Watermark Ports 0 - 3 ($0x600 –
0x603)" on page 203
"TX FIFO Low Watermark Register
Ports 0 - 3 ($0x60A – 0x60D)" on
page 204.
DTPA is updated on the rising edge of
TFCLK.
Selected-PHY Transmit Packet Available.
STPA is only meaningful in a 32-bit multi-
PHY mode.
STPA is a direct status indication for
transmit FIFOs of ports 0:3.
When High, STPA indicates that the amount
of data in the TX FIFO, specified by the
latest in-band address, is below the
TX FIFO High watermark. When the High
watermark is crossed, STPA transitions Low
to indicate the TX FIFO is almost full. It
stays Low until the amount of data in the
TX FIFO goes back below the TX FIFO Low
watermark. At this point, STPA transitions
High to indicate that the programmed
3.3 V
number of bytes are now available for data
LVTTL
transfers.
NOTE: For more information, see
Table 132 "TX FIFO High
Watermark Ports 0 - 3 ($0x600 –
0x603)" on page 203
"TX FIFO Low Watermark Register
Ports 0 - 3 ($0x60A – 0x60D)" on
page 204.
STPA provides the status indication for the
selected port to avoid FIFO overflows while
polling is performed. The port reported by
STPA is updated on the following rising
edge of TFCLK after TSX is sampled as
asserted. STPA is updated on the rising
edge of TFCLK.
and Table 133
and Table 133
42