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General-Purpose Timers
16.2.6.1.2 Write Nonposting Synchronization Mode
This mode is used if the GPTi.
[2] POSTED bit is set to 0.
This mode uses a nonposted write scheme to update any internal register. Therefore, the write transaction
is not acknowledged on the L4 interface until the effective write operation occurs after the
resynchronization in the timer functional clock domain. The drawback is that both the interconnect and the
device that requested the write transaction are stalled during this period.
The same full resynchronization scheme is used for a read transaction, and the same stall period applies.
A register read following a write to the same register is always coherent.
This mode is functional regardless of the ratio between the L4 interface frequency and the timer clock
frequency.
16.2.6.2 Reading From Timer Counter Registers
In 16-bit access mode, reading the 16 LSBs from the timer counter registers (GPTi.
, GPTi.
and GPTi.
) captures the current timer counter value. This must be followed by reading the
16MSBs.
IVA2.2 subsystem 16-bit accesses can be interleaved with MPU subsystem 32-bit accesses.
NOTE:
LSB/MSB accesses cannot be interleaved (that is, the sequence LSB register 1, LSB
register 2, MSB register 1, MSB register 2 is not supported).
2723
SWPU177N – December 2009 – Revised November 2010
Timers
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...