"Memory Write" (SVC/MEM)

ITOS Mnemonic:  LMEMLOADMEM

View Options: (help)

Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Context:

Description:

Load data to a region in memory.

Layout:  (hide detail; help)

Memory Write (LMEMLOADMEM) Telecommand Packet Format
0x	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
000	Version=0			T=1	SH	APID=0x644:4
002	SF=3		Sequence Count
004	Packet Length=55
006	0	Function Code=4
008	CIDBF idents
00A	CSIZE16 wordCount
00C	CADDR32 addr
010	CDATA16 data[0]
012	CDATA16 data[1]
014	CDATA16 data[2]
016	CDATA16 data[3]
018	CDATA16 data[4]
01A	CDATA16 data[5]
01C	CDATA16 data[6]
01E	CDATA16 data[7]
020	CDATA16 data[8]
022	CDATA16 data[9]
024	CDATA16 data[10]
026	CDATA16 data[11]
028	CDATA16 data[12]
02A	CDATA16 data[13]
02C	CDATA16 data[14]
02E	CDATA16 data[15]
030	CDATA16 data[16]
032	CDATA16 data[17]
034	CDATA16 data[18]
036	CDATA16 data[19]
038	CDATA16 data[20]
03A	CDATA16 data[21]
03C	Packet Checksum

LMEMLOADMEM (pkt)
|  CIDBF idents (bf)
|  |  CLATUNIT latUnit (0-3)
|  |  CTRANID tranID (4-15)
|  CSIZE16 wordCount (fld)
|  CADDR32 addr (bf)
|  |  CADDRHI hi (0-15)
|  |  CADDRLO lo (16-31)
|  CDATA16 data[0-21] (fld)

typedef struct _MEM_LMEMLOADMEM_Pkt {

    /* CCSDS header */
    char                 hdr[8];

    /* Command payload */
    MEM_LMEMLOADMEM_Prm  pay;

} MEM_LMEMLOADMEM_Pkt;

Fields:

CADDR32 (index)

Attribute(s):  

Brief:  "32-Bit Address/Offset Bitfield"

Instance(s):  addr

Bitfield containing the full 32 bits of the starting address or offset.

CDATA16 (index)

Attribute(s):  

Brief:  "16-Bit Data Value"

Instance(s):  data

16-bit data value.

CIDBF (index)

Attribute(s):  

Brief:  "LAT Unit and Transaction ID Bitfield"

Instance(s):  idents

Bitfield to contain the LAT unit that is the target of a MEM telecommand and the transaction ID for the MEM telecommand.

CSIZE16 (index)

Attribute(s):  

Brief:  "16-Bit Word count"

Instance(s):  wordCount

Number of 32-bit words to load/dump.