ISP1362BD NXP Semiconductors, ISP1362BD Datasheet - Page 42

• Manufacturer Part Number: ISP1362BD
• Description: USB Interface IC USB OTG CONTROLLER
• Manufacturer: NXP Semiconductors

Specifications of ISP1362BD

• Operating Supply Voltage: 3 V to 3.6 V
• Lead Free Status / Rohs Status: Details
• Other names: ISP1362BD,157

NXP Semiconductors
ISP1362_5
Product data sheet
structure in the memory buffer will have an offset of 0 bytes and the second PTD structure
will have an offset of 40 bytes [sum of the block size (32 bytes) and the PTD header size
(8 bytes)]. Because of the fixed block size of the ISP1362 Host Controller, however, even a
PTD with 4 bytes of payload will occupy all the 40 bytes in a block.
In the isochronous PTD, the Host Controller uses a more flexible method to calculate the
PTD offset because each PTD can have a different payload size. The actual amount of
space for the payload, however, must be a multiple of double word. Therefore, a 10 bytes
payload must have a reserved data size of 12 bytes. Take for example there are four PTDs
in the ISTL0 buffer area with payload sizes of 200 bytes, 10 bytes, 1023 bytes and
30 bytes. Then, the offset of each of these PTDs will be as follows:
PTD1 (200 bytes) — offset = 0
PTD2 (10 bytes) — offset = (200 + 8) = 208
PTD3 (1023 bytes) — offset = (200 + 8) + (12 + 8) = 228
PTD4 (30 bytes) — offset = (200 + 8) + (12 + 8) + (1024 + 8) = 1260
The PTD data stored in the Host Controller buffer memory will not be processed, unless
the respective control bits (ATL_Active, INTL_Active, ISTL0_BufferFull or
ISTL1_BufferFull) in HcBufferStatus are set.
The PTD data in the ATL or interrupt buffer memory can be disabled by setting the
respective skip bit in HcATLPTDSkipMap and HcINTLPTDSkipMap. To skip a particular
PTD in the ATL or interrupt buffer, the HCD may set the corresponding bit of the SkipMap
register. For example, setting the HcATLPTDSkipMap register to 0011h will cause the
Host Controller to skip the first and the fifth PTDs in the ATL buffer memory.
Certain fields in the PTD header are used by the Host Controller to inform the HCD about
the status of the transfer. These fields are indicated by the ‘Status Update by HC’ column.
These fields are updated after every transaction to reflect the current status of the PTD.
Fig 22. PTD data stored in the buffer memory
Rev. 05 — 8 May 2007
bottom
top
buffer memory
payload data
payload data
payload data
PTD header
PTD header
PTD header
004aaa121
PTD data #1
PTD data #2
PTD data #N
Single-chip USB OTG Controller
© NXP B.V. 2007. All rights reserved.
ISP1362
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