Datasheet
LPC435X_3X_2X_1X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4 — 19 August 2014 73 of 158
NXP Semiconductors
LPC435x/3x/2x/1x
32-bit ARM Cortex-M4/M0 microcontroller
7.18.4.1 Features
• Dynamic memory interface support including single data rate SDRAM.
• Asynchronous static memory device support including RAM, ROM, and NOR flash,
with or without asynchronous page mode.
• Low transaction latency.
• Read and write buffers to reduce latency and to improve performance.
• 8/16/32 data and 24 address lines wide static memory support.
• 16 bit and 32 bit wide chip select SDRAM memory support.
• Static memory features include:
– Asynchronous page mode read
– Programmable Wait States
– Bus turnaround delay
– Output enable and write enable delays
– Extended wait
• Four chip selects for synchronous memory and four chip selects for static memory
devices.
• Power-saving modes dynamically control EMC_CKEOUT and EMC_CLK signals to
SDRAMs.
• Dynamic memory self-refresh mode controlled by software.
• Controller supports 2048 (A0 to A10), 4096 (A0 to A11), and 8192 (A0 to A12) row
address synchronous memory parts. Those are typically 512 MB, 256 MB, and
128 MB parts, with 4, 8, 16, or 32 data bits per device.
• Separate reset domains allow the for auto-refresh through a chip reset if desired.
• SDRAM clock can run at full or half the Cortex-M4 core frequency.
Note: Synchronous static memory devices (synchronous burst mode) are not supported.
OE EMC_OE EMC_OE EMC_OE EMC_OE
WE EMC_WE EMC_WE EMC_WE EMC_WE
CKEOUT EMC_
CKEOUT[3:0]
EMC_
CKEOUT[1:0]
EMC_
CKEOUT[1:0]
EMC_
CKEOUT[1:0]
CLK EMC_CLK[3:0];
EMC_CLK01,
EMC_CLK23
EMC_CLK0,
EMC_CLK3;
EMC_CLK01,
EMC_CLK23
EMC_CLK0,
EMC_CLK3;
EMC_CLK01,
EMC_CLK23
EMC_CLK0,
EMC_CLK3;
EMC_CLK01,
EMC_CLK23
DQMOUT EMC_
DQMOUT[3:0]
-EMC_
DQMOUT[1:0]
EMC_
DQMOUT[1:0]
DYCS
EMC_
DYCS[3:0]
EMC_DYCS[1:0] EMC_DYCS[2:0] EMC_DYCS[1:0]
CAS EMC_CAS EMC_CAS EMC_CAS EMC_CAS
RAS EMC_RAS EMC_RAS EMC_RAS EMC_RAS
Table 6. EMC pinout for different packages
Function LBGA256 TFBGA100 LQFP208 LQFP144