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SLVSH95 July 2024 TPS546C25

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7.1 Conventions for Documenting Block Commands

According to the SMBus specification, block commands are transmitted across the PMBus interface in ascending order. The description below shows the convention this document follows for documenting block commands.

When block values are listed as register map tables, block values are listed in byte order from top to bottom starting with Byte N and ending with Byte 1.

Byte 1 (first byte sent) corresponds to bits 7:0.
Byte 2 (second byte sent) corresponds to bits 15:8.
Byte 3 (third byte sent) corresponds to bits 23:16.
… and so on

When block values are listed as text in hexadecimal, block values are listed in byte order, from left to right, starting with Byte N and ending with Byte 1 with a space between each byte of the value. For example, in block 00 28 4C 54 49 54h, the byte order returned in response to a Block Read is:

Byte 1, bits 7:0 = 54h
Byte 2, bits 15:8 = 49h
Byte 3, bits 23:16 = 54h
Byte 4, bits 31:24 = 4Ch
Byte 5, bits 39:32 = 28h
Byte 6, bits 47:40 = 00h

Figure 7-1 Block Command Byte Ordering

47	46	45	44	43	42	41	40
RW	RW	RW	RW	RW	RW	RW	RW
Byte N

39	38	37	36	35	34	33	32
RW	RW	RW	RW	RW	RW	RW	RW
Byte …

31	30	29	28	27	26	25	24
RW	RW	RW	RW	RW	RW	RW	RW
Byte 4

23	22	21	20	19	18	17	16
RW	RW	RW	RW	RW	RW	RW	RW
Byte 3

15	14	13	12	11	10	9	8
RW	RW	RW	RW	RW	RW	RW	RW
Byte 2

7	6	5	4	3	2	1	0
RW	RW	RW	RW	RW	RW	RW	RW
Byte 1

LEGEND: R/W = Read/Write; R = Read only