Rainbow Electronics W90N745CDG - Manual (Page 284)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 279 - Revision A2
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved
7 6 5 4 3 2 1 0
FMES RFTLS DMS IID NIP
BITS DESCRIPTIONS
[31:8] Reserved -
[7] FMES
FIFO Mode Enable Status
This bit indicates whether the FIFO mode is enabled or not. Since the
FIFO mode is always enable, this bit always shows the logical 1 when
CPU is reading this register.
[6:5] RFTLS
RX FIFO Threshold Level Status
These bits show the current setting of receiver FIFO threshold level
(RTHO). The meaning of RTHO is defined in the following FCR
description.
[4] DMS
DMA Mode Select
The DMA function is not implemented in this version. When reading IIR,
the DMS is always returned 0.
[3:1] IID
Interrupt Identification
The IID together with NIP indicates the current interrupt request from
UART.
[0] NIP
No Interrupt Pending
There is no pending interrupt.