Rev. 3.0, 03/01, page 140 of 390
(8) Tx Status Register (ITSR)
Address: H'1000710A (Bank 0, Read)
Bit
7
6
5
4
3
2
1
0
Bit Name
-
-
-
-
TFUR
EOM
TFRDY
EEOM
Initial Value
-
-
-
-
0
0
1
0
R/W
-
-
-
-
R
R
R
R
Bit
Description
Default
7 - 4
Reserved
-
3
Tx FIFO Underrun (TFUR)
When set to ‘1,’ indicates Tx FIFO ran out of data before the transmitter could finish
transmitting all the data (i.e. Tx FIFO is empty, and the Tx Byte Count value is greater
than zero). This bit must be reset by an explicit FIFO UNDERRUN/EOM LATCH
command.
0
2
End of Message (EOM)
When set to ‘1,’ indicates transmission completed successfully. The EOM interrupt occurs
immediately after the CRC and ending flag have been transmitted. If bit 2 of Tx Control 1
Register (Auto Reset EOM) is enabled, the EOM bit will automatically clear when Tx
Status is read. The EOM bit can also cleared by a RESET FIFO UNDERRUN LATCH
command from the Reset Command Register.
0
1
Tx FIFO Ready (TFRDY)
When set to ‘1,’ indicates Tx FIFO is ready for more data transfers. When the bit 6 of Tx
Control 1 Register is set, an interrupt is generated whenever this condition becomes true.
Alternately, this bit may be polled when the interrupt is disabled. When Tx FIFO is full, this
bit is cleared to ‘0’.
1
0
Early EOM (EEOM)
When set to ‘1,’ indicates the Tx Byte Count has reached the count level set by the Early
EOM Interrupt Level bits. This bit is cleared by reading Tx Status.
0
Summary of Contents for HD64465
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