GR740-UM-DS, Nov 2017, Version 1.7 258 www.cobham.com/gaisler
GR740
Table 320. 0x84 - RTC - GR1553B RT Config register
31 16 15 14 13 12 7 6 5 1 0
RTKEY SYS SYDS BRS RESERVED RTEIS RTADDR RTEN
0 1 1 1 0 0 0b11111 0
w rwrwrw r r rw rw
31 : 16 Safety code (RTKEY) - Must be written as 0x1553 when changing the RT address, otherwise the address
field is unaffected by the write. When reading the register, this field reads 0x0000.
If extra safety keys are enabled (see Hardware Config Register), the lower half of the key is used to also pro-
tect the other fields in this register.
15 Sync signal enable (SYS) - Set to ‘1’ to pulse the rtsync output when a synchronize mode code (without
data) has been received
14 Sync with data signal enable (SYDS) - Set to ‘1’ to pulse the rtsync output when a synchronize with data
word mode code has been received
13 Bus reset signal enable (BRS) - Set to ‘1’ to pulse the busreset output when a reset remote terminal mode
code has been received.
12: 7 RESERVED
6 (RTEIS) - Reads ‘1’ if current address was set through external inputs.
After setting the address from software this field is set to ‘0’
5 : 1 RT Address (RTADDR) - This RT:s address (0-30)
0 RT Enable (RTEN) - Set to ‘1’ to enable listening for requests
Table 321. 0x88 - RTBS - GR1553B RT Bus status register
31 987543210
RESERVED TFDE RESERVED SREQ BUSY SSF DBCA TFLG
0 0 0 00000
r rw r rw rw rw rw rw
31: 9 RESERVED
8 Set Terminal flag automatically on DMA and descriptor table errors (TFDE)
7: 5 RESERVED
4 : 0 These bits will be sent in the RT:s status responses over the 1553 bus.
4 Service request (SREQ)
3 Busy bit (BUSY)
Note: If the busy bit is set, the RT will respond with only the status word and the transfer “fails”
2 Subsystem Flag (SSF)
1 Dynamic Bus Control Acceptance (DBCA)
Note: This bit is only sent in response to the Dynamic Bus Control mode code
0 Terminal Flag (TFLG)
The BC can mask this flag using the “inhibit terminal flag” mode command, if legal
Table 322. 0x8C - RTSW - GR1553B RT Status words register
31 16 15 0
BIT WORD (BITW) VECTOR WORD (VECW)
0x0000 0x0000
rw rw
31 : 16 BIT Word (BITW) - Transmitted in response to the “Transmit BIT Word” mode command, if legal
15 : 0 Vector word (VECW) - Transmitted in response to the “Transmit vector word” mode command, if legal.
Table 323. 0x90 - RTSY - GR1553B RT Sync register
31 16 15 0
SYNC TIME (SYTM) SYNC DATA (SYD)
0x0000 0x0000
rr
31 : 16 Sync Data (SYD) - The value of the RT timer at the last sync or sync with data word mode command, if legal.
15 : 0 Sync Time (SYTM) - The data received with the last synchronize with data word mode command, if legal
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