W83977ATF Datasheet, PDF (76/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
Advanced IR:
Bit 7, 6: RXFTL1, 0 - Receiver FIFO Threshold Level
Its definition is the same as Legacy IR. RXTH_I becomes 1 when the Receiver FIFO
Threshold Level is equal to or larger than the defined value shown as follow.
Bit 5, 4:
RXFTL1, 0
(Bit 7, 6)
RX FIFO Threshold Level RX FIFO Threshold Level
(FIFO Size: 16-byte)
(FIFO Size: 32-byte)
00
1
1
01
4
4
10
8
16
11
14
26
Note that the FIFO Size is selectable in SET2.Reg4.
TXFTL1, 0 - Transmitter FIFO Threshold Level
TXTH_I (Transmitter Threshold Level Interrupt) is set to 1 when the Transmitter
Threshold Level is less than the programmed value shown below.
TXFTL1, 0
(Bit 5, 4)
00
01
10
11
TX FIFO Threshold Level TX FIFO Threshold Level
(FIFO Size: 16-byte)
(FIFO Size: 32-byte)
1
1
3
7
9
17
13
25
Bit 3 ~0 Same as in Legacy IR Mode
4.2.4 Set0.Reg3 - IR Control Register/Set Select Register (UCR/SSR):
These two registers share the same address. In all Register Sets, Set Select Register (SSR) can be
programmed to select a desired Set, but IR Control Register can only be programmed in Set 0 and
Set 1. In other words, writing to Reg3 in Sets other than Set 0 and Set 1 will not affect IR Control
Register. The mapping of entry Set and programming value is shown below.
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Publication Release Date:April 1998
Revision 0.52