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General-Purpose Memory Controller
Table 10-1. GPMC I/O Description (continued)
Pin Name
I/O
Description
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_wait[3:0]
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)
shows the use of address and data GPMC controller pins based on the type of external device.
Table 10-2. GPMC Pin Multiplexing Options
GPMC Pin
Multiplexed
16-Bit NAND
8-Bit NAND
Address Data
Device
Device
16-Bit Device
gpmc_a[11]
A27
Not used
Not used
gpmc_a[10]
A26
Not used
Not used
gpmc_a[9]
A25
Not used
Not used
gpmc_a[8]
A24
Not used
Not used
gpmc_a[7]
A23
Not used
Not used
gpmc_a[6]
A22
Not used
Not used
gpmc_a[5]
A21
Not used
Not used
gpmc_a[4]
A20
Not used
Not used
gpmc_a[3]
A19
Not used
Not used
gpmc_a[2]
A18
Not used
Not used
gpmc_a[1]
A17
Not used
Not used
gpmc_d[15]
A16/D15
D15
Not used
gpmc_d[14]
A15/D14
D14
Not used
gpmc_d[13]
A14/D13
D13
Not used
gpmc_d[12]
A13/D12
D12
Not used
gpmc_d[11]
A12/D11
D11
Not used
gpmc_d[10]
A11/D10
D10
Not used
gpmc_d[9]
A10/D9
D9
Not used
gpmc_d[8]
A9/D8
D8
Not used
gpmc_d[7]
A8/D7
D7
D7
gpmc_d[6]
A7/D6
D6
D6
gpmc_d[5]
A6/D5
D5
D5
gpmc_d[4}
A5/D4
D4
D4
gpmc_d[3]
A4/D3
D3
D3
gpmc_d[2]
A3/D2
D2
D2
gpmc_d[1]
A2/D1
D1
D1
gpmc_d[0]
A1/D0
D0
D0
Enabling the GPMC.
[1] LIMITEDADDRESS bit forces A[26:11] to 1 on the GPMC I/O
side. Thus, only devices with 2 Kbytes of addressing space can be accessed using gpmc_a[11:1] .
With all device types, the GPMC does not drive unnecessary address lines. They stay at their reset value
of 0x00.
Address mapping supports address/data-multiplexed 16-bit wide devices:
2117
SWPU177N – December 2009 – Revised November 2010
Memory Subsystem
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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