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Read Tag Page
Command to read 4 bytes of data from HT1 32 bit page. If the read was successful, indicated
by acknowledge status flags then four bytes of tag data follow.
B7 B0
Command:
Argument1:
Acknowledge:
0 1 0 1 0 0 1 0
x x N N N N N N
1 1 F F F F F X
(ASCII “R”, 0x52)
(N = HT1 page address 0-63)
(F = Status flags)
Data only follows if read was successful
Reply1:
Reply2:
Reply3:
Reply4:
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
(D = msb data read from HT1)
(D = lsb data read from HT1)
Read Tag Block
Command to read up to 16 bytes of data from HT1 memory. A Block is made up of four
pages (each page being 4 bytes of data). If the specified page lies on the block boundary then
all 16 bytes (4 pages) can be read. If the specified page is on the block boundary + 1 then 12
bytes (3 pages) can be read. In this way 16, 12, 8 or 4 bytes of data can be retrieved from the
tag depending on the page number specified and it’s position within the block. If the read was
successful, indicated by acknowledge status flags then up to 16 bytes of tag data follow.
B7 B0
Command:
Argument1:
Acknowledge:
0 1 1 1 0 0 1 0
x x N N N N N N
1 1 F F F F F X
(ASCII “r”, 0x72)
(N = HT1 page address 0-63)
(F = Status flags)
+ up to 16 bytes
Data only follows if read was successful
Reply1: D D D D D D D D (D = msb data read from HT1)
Reply2: D D D D D D D D (PAGE N DATA)
Reply3: D D D D D D D D
Reply4: D D D D D D D D (D = lsb data read from HT1)
|
| Up to 16 bytes can be specified depending on page address N
| ie. Perform PAGE/4 => if remainder (mod) = 0 then full block (16 bytes)
| if remainder = 1 then 12 bytes read
| if remainder = 2 then 8 bytes read
| if remainder = 3 then 4 bytes read
V
Reply13: D D D D D D D D (D = msb data read from HT1)
Reply14: D D D D D D D D (PAGE N+3 DATA)
Reply15: D D D D D D D D
Reply16: D D D D D D D D (D = lsb data read from HT1)
10
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