PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 156

• Manufacturer Part Number: PC87307VUL
• Description: PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O
• Manufacturer: National Semiconductor

www.national.com
Bits 5-0 - Number of Bytes in TX_FIFO (TFL(5-0))
Bits 7,6 - Reserved
7.12.7 RX_FIFO Current Level Register (RXFLV), IrDA
This read-only register returns the number of bytes in the
RX_FIFO. It can be used for software debugging.
Bits 5-0 - Number of Bytes in RX_FIFO (RFL(5-0))
Bits 7,6 - Reserved
Read/Write 0’s.
Note: The contents of TXFLV and RXFLV are not frozen
0
0
0
0
7
7
These bits specify the number of bytes in the TX_FIFO.
Read/Write 0’s.
These bits specify the number of bytes in the RX_FIFO.
during CPU reads. Therefore, invalid data could be re-
turned if the CPU reads these registers during normal
transmitter and receiver operation. To obtain correct da-
ta, the software should perform three consecutive reads
and then take the data from the second read, if first and
second read yield the same result, or from the third
read, if first and second read yield different results.
Reserved
Reserved
0
0
0
0
6
6
or Consumer-IR Modes, Bank 2, Offset 07h
Reserved
FIGURE 7-27. RXFLV Register Bitmap
FIGURE 7-26. TXFLV Register Bitmap
Reserved
0
0
5
5
0
0
4
4
TFL5
RFL5
0
0
3
3
TFL4
RFL4
0
0
Extended Modes
2
2
Extended Modes
TFL3
RFL3
0
0
1
1
TFL2
RFL2
0
0
0
0
TFL1
RFL1
Reset
Required
Reset
Required
UART1 and UART2 (with IR) (Logical Devices 5 and 6)
TFL0
RFL0
Register (RXFLV)
Register (TXFLV)
Current Level
Current Level
TX_FIFO
Offset 06h
Offset 07h
Bank 2,
Bank 2,
156
7.13 BANK 3 – MODULE REVISION ID AND SHADOW
Bank 3 contains the Module Revision ID register which
identifies the revision of the module, shadow registers for
monitoring various registers whose contents are modified
by being read, and status and control registers for handling
the flow control.
7.13.1 Module Revision ID Register (MRID),
This read-only register identifies the revision of the module.
When read, it returns the module ID and revision level. This
module returns the code 2xh, where x indicates the revision
number.
Bits 3-0 - Revision ID (MID3-0)
Bits 7-4 - Module ID (MID7-4)
04h-07h
0
7
Offset
The value in these bits identifies the revision level.
The value in these bits identifies the module type.
00h
01h
02h
03h
REGISTERS
0
6
Bank 3, Offset 00h
FIGURE 7-28. MRID Register Bitmap
1
5
TABLE 7-19. Bank 3 Register Set
Register
SH_FCR Shadow of FIFO Control Register
SH_LCR
Module ID(MID 7-4)
0
4
Name
MRID
LCR/
BSR
x
3
x
2
x
1
Module Revision ID Register
Revision ID(RID 3-0)
Shadow of LCR Register
x
0
Link Control Register/
Bank Select Register
Reserved
Reset
Required
Description
(Read Only)
(Read Only)
Module Revision ID
Offset 00h
Register
Bank 3,
(MRID)