AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
7.7
External Memory Interfaces
The device includes the following external memory interfaces:
•
General-purpose memory controller (GPMC)
•
mDDR(LPDDR), DDR2, DDR3, DDR3L Memory Interface (EMIF)
7.7.1
General-Purpose Memory Controller (GPMC)
NOTE
For more information, see the Memory Subsystem and General-Purpose Memory Controller
section of the
AM335x Sitara Processors Technical Reference Manual
(
The GPMC is the unified memory controller used to interface external memory devices such as:
•
Asynchronous SRAM-like memories and ASIC devices
•
Asynchronous page mode and synchronous burst NOR flash
•
NAND flash
7.7.1.1
GPMC and NOR Flash—Synchronous Mode
and
assume testing over the recommended operating conditions and electrical
characteristic conditions below (see
through
Table 7-20. GPMC and NOR Flash Timing Conditions—Synchronous Mode
PARAMETER
MIN
TYP
MAX
UNIT
Input Conditions
t
R
Input signal rise time
1
5
ns
t
F
Input signal fall time
1
5
ns
Output Condition
C
LOAD
Output load capacitance
3
30
pF
Table 7-21. GPMC and NOR Flash Timing Requirements – Synchronous Mode
OPP100
OPP50
NO.
UNIT
MIN
MAX
MIN
MAX
F12
t
su(dV-clkH)
Setup time, input data gpmc_ad[15:0] valid before output clock
3.2
13.2
ns
gpmc_clk high
F13
t
h(clkH-dV)
Hold time, input data gpmc_ad[15:0]
Industrial extended
4.74
4.74
ns
valid after output clock gpmc_clk
temperature
high
(-40°C to 125°C)
All other temperature ranges
4.74
2.75
F21
t
su(waitV-clkH)
Setup time, input wait gpmc_wait[x]
valid before output clock
3.2
13.2
ns
gpmc_clk high
F22
t
h(clkH-waitV)
Hold time, input wait gpmc_wait[x]
Industrial extended
4.74
4.74
ns
valid after output clock gpmc_clk
temperature
high
(-40°C to 125°C)
All other temperature ranges
4.74
2.75
(1) In gpmc_wait[x], x is equal to 0 or 1.
Copyright © 2011–2015, Texas Instruments Incorporated
Peripheral Information and Timings
127
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