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參數(shù)資料
| 型號(hào)： | FX980L6 |
| 廠商： | CML MICROSYSTEMS PLC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 40/86頁 |
| 文件大?。?/td> | 821K |
| 代理商： | FX980L6 |
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TETRA Baseband Processor
FX980
1997 Consumer Microcircuits Limited
45
D/980/3
TxFIFOStatus
Title:
Transmit data FIFO Status register
Address:
$0x22
Function:
R
Description:
This register is the Tx Data FIFO status register. The TxIrqActive bit is set active when one of
the other bits in this register is the source of an interrupt event. Some of these status conditions
are caused by transitory events, therefore their state is latched (marked with an ‘L’). The bits
marked with a parenthesised ‘L’ are only latched in their interrupt generation state if their
associated mask bit is inactive. Reading this status register causes all latched bits to be set
inactive, unless an error event is currently pending.
Setting any bit of this register High will cause an interrupt to be generated (N_IRQ will be set
Low) if the source of the interrupt has not been masked in the corresponding Mask register.
Bit
Name
Active State
Function
7
TxPathEn
High/
Low
R(L)
When active (High) this bit shows that the Tx Data
path is currently active. This enables the user to
confirm that ramp down has completed.
For interrupt generation purposes, a logic Low on
this bit will be considered as active.
6
FIFOUnderRead
High
RL
Error status bit. When active indicates a read from
the FIFO occurred while the FIFO was empty.
5
FIFOOverWrite
High
RL
Error status bit. When active indicates a write to the
FIFO occurred while the FIFO was full.
4
FIFOFull
High/
Low
R(L)
Most significant FIFO length status bit. When active
(High) this bit also indicates the FIFO is full.
For interrupt generation purposes, a logic Low on
this bit will be considered as active.
3:2
FIFOLength
(Low) R(L)
These two bits contain the pointer to the next free
FIFO address and indicate the following status:
00 - indicates FIFO is empty
01 - one location used
10 - two locations used
11 - three locations used
For interrupt generation purposes, a logic Low on
either of these bits will be considered as active.
1
FIFOEmpty
High
R(L)
When active indicates the FIFO is empty.
0
FifoIrqActive
High
RL
This bit is set High if there is an active interrupt
caused by one of the status bits in this register.
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