UT1553RTMP View Datasheet(PDF) - Aeroflex UTMC
Part Name
Description
Manufacturer
UT1553RTMP Datasheet PDF : 40 Pages
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MSB
B
P
A
15
BASE POINTER DATA
REGISTER
B
P
A
6
64-WORD
POINTER
10 MOST SIGNIFICANT ADDRESS LINES
16
6 LEAST SIGNIFICANT ADDRESSLINES
THE 16-BIT ADDRESSPOINTS
TO A SPECIFIC LOCATION
IN THE 16-BIT WORD POINTER BLOCK
1553 DATA ADDRESS
T/R
BIT
SUBADDRESS
THIS DATA IS FROM THE
CURRENT 1553 COMMAND WORD
Figure 12. Constructionof the Block Pointer Address (BPA) Bits
CURRENT 1553 COMMAND
WORD
SUBADDRESS 1 POINTER
SUBADDRESS 2 POINTER
•••
SUBADDRESS 29 POINTER
SUBADDRESS 30 POINTER
SINGLE BUFFER MODE
POINTER
MODE CODE DATA
POINTER
SUBADDRESS 1 POINTER
SUBADDRESS 2 POINTER
•••
SUBADDRESS 29 POINTER
SUBADDRESS 30 POINTER
NOT USED
POINTER
BLOCK
LOCATION
(H)
00
01
02
•••
1D
1E
1F
20
21
22
•••
3D
3E
3F
Figure 13. The 64-Word Pointer Block
4.3 Pointer Block Location Definitions
For the following description of the Pointer Block locations,
please refer to figure 13.
Command Word Data - Location 0-0H of the Pointer Block
contains the last valid 1553 command word the RTMP
received. Bit times 4 through 19 (figure 14) of the 1553
command word are stored in bit positions 15 through 0,
respectively. The RTMP updates this location with the most
recent command word except when the RTMP is in the
1553B mode and it receives a Transmit Last Command
mode code.
Separate Mode, Receive Data Pointers - Pointer Block
address locations 1-30 (01H-1EH) contain the pointer
values for each receive command word subaddress if the
RTMP is operating in the separate mode (Bit 4 of the BPD
= 0). The RTMP selects the address pointer data from one
of these locations by using the subaddress of the most recent
receive command word. The RTMP internally stores this
pointer value. This stored pointer value points to the
memory location where the RTMP stores the received data
associated with this subaddress. After the RTMP has stored
all data associated with this subaddress in memory, the
RTMP stores the updated pointer value back into the
selected location in the Pointer Block. The updated pointer
value points to the next available location in memory.
RTMP-19
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