ZHCS103Q March 2011 – March 2024 TUSB7320 , TUSB7340
PRODUCTION DATA
This read only register defines basic structural parameters supported by the TUSB73X0.
BAR0 register offset: 08h
Register type: Read-Only
Default value: 0C00 00F1h
Bit No. | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
Reset State | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit No. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reset State | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
BIT | FIELD NAME | ACCESS | DESCRIPTION |
---|---|---|---|
31:27 | MAX_SCRATCH_BUF | r | Max Scratchpad Buffers. This field indicates the number of Scratchpad Buffers system software reserves. The TUSB73X0 uses one Scratchpad Buffer. |
26 | SPR | r | Scratchpad Restore. This bit is 1b to indicate that the TUSB73X0 requires the integrity of the Scratchpad Buffer space to be maintained across power events. |
25:13 | RSVD | r | Reserved. Returns zeros when read. |
12:8 | IOC_INTERVAL | r | IOC Interval. This field is 0b. |
7:4 | ERST_MAX | r | Event Ring Segment Table Max. This field is 1111b to indicate that the TUSB73X0 supports up to 32K Event Ring Segment Table entries. |
3:0 | IST | r | Isochronous Scheduling Threshold. This field is 0001b to indicate that software can add a TRB no later than 1 Microframes before that TRB is scheduled to be executed. |