Chapter 2
Channel Operation
M4K708 Module: User’s Manual
page 2 - 13
Read
The Receive FIFO Word Type Register provides the currently read FIFO 16-bit
word type. It can be read, every time, immediately after reading the Receive FIFO
Read Register to review the current Word type.
Read
The Receive Word FIFO Count register indicates the number of 708 Words received
(0 – 65535). The register wraps around to 0 after reaching the maximum value of
FFFF (H).
Initialized to 0000 (H) after reset
Write
In Transmit mode these FIFO registers contain the data to be transmitted and are
written as long as the FUL (Channel FIFO Full) bit is ‘0’. Each 1600-bit 708 Word
block is comprised of 100 16-bit words and must be written in the following
sequence:
The block is written in separate addresses in order to indicate to the hardware the
beginning and end of the 708 Word block.
2.3.12
Receive FIFO Word Type Register
Address:
xx022 (H)
Bit
Bit Name
Description
02-15
Reserved
Set to 0
00-01
RFWT
Receive FIFO Word Type
10 = Time Tag Lo
11 = Time Tag Hi
00 = Data
01 = Status
Receive FIFO Word Type Register
2.3.13
Receive FIFO Word Count Register
Address:
xx024 (H)
2.3.14
Transmit FIFO Data / First / Last Write Register
Address:
xx040 (H), xx042 (H),
xx044 (H)
Register
Sequence
Content
Address
First
First write
Data bits [16 - 1]
xx042 H
Data
Next 98 writes
Data bits [1584 - 17]
xx040 H
Last
Last write
Data bits [1600 - 1585]
xx044 H
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