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sDMA
Table A-16. GPMC I/O Description (continued)
Pin Name
I/O
Description
gpmc_nadv_ale
O
Address valid (active low). Also used as address latch enable (active high)
for NAND protocol memories.
gpmc_noe_nre
O
Output enable (active low). Also used as read enable (active low) for NAND
protocol memories.
gpmc_nwe
O
Write enable (active low)
gpmc_nbe0_cle
O
Lower-byte enable (active low). Also used as command latch enable for
NAND protocol memories.
gpmc_nbe1
O
Byte 1 enable (active low)
gpmc_nwp
O
Write protect (active low)
gpmc_wait0
I
External wait signal for NOR and NAND protocol memories
gpmc_wait1
I
External wait signal for NOR and NAND protocol memories
gpmc_wait2
I
External wait signal for NOR and NAND protocol memories
gpmc_wait3
I
External wait signal for NOR and NAND protocol memories
gpmc_io_dir
O
gpmc_d[15:0] signal direction control:
• Low during transmit (for write access: data OUT from GPMC to
memory)
• High during receive (for read access: data IN from memory to GPMC)
A.9
sDMA
NOTE:
This subsection provides a quick reference about the unavailable modules, which interact
with the sDMA. Cells highlighted in orange in the tables indicate modules with removed
functionality in the OMAP36xx in CYN package devices. These modules are still present on
the die; therefore, their mappings are provided to control their activity and for debug
purposes.
A.9.1 sDMA Environment
The external DMA requests sys_ndmareq0 and sys_ndmareq1 are supported by the SDMA controller but
are unaccessible outside the OMAP36xx in CYN package devices.
The sDMA controller supports external DMA requests through the gpmc_a9 and gpmc_a10 pins in
configuration (mux) mode 1 (sys_ndmareq2 and sys_ndmareq3, respectively).
describes the external sDMA request signals.
Table A-17. External SDMA Request Signals
Signal Name
I/O
(1)
Description
Reset
sys_ndmareq0
(2)
I
External DMA request signal (active low)
1
sys_ndmareq1
(2)
I
External DMA request signal (active low)
1
sys_ndmareq2
(3)
I
External DMA request signal (active low)
1
sys_ndmareq3
(4)
I
External DMA request signal (active low)
1
(1)
I = Input; O = Output
(2)
This signal is part of the sDMA functionality but is not supported in the OMAP36xx in CYN package devices.
(3)
Through gpmc_a9 pin in configuration mode 1.
(4)
Through gpmc_a10 pin in configuration mode 1.
A.9.2 sDMA Integration
A.9.2.1
DMA Requests to the sDMA Controller
lists the sDMA request mapping of the OMAP36xx in CYN package devices.
3671
SWPU177N – December 2009 – Revised November 2010
OMAP36xx Multimedia Device in CYN Package
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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