AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 57

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

The 80-pin EZ-USB package provides a 16-bit address bus, an 8-bit bus, and memory
control signals PSEN#, RD#, and WR#. These signals are used to expand EZ-USB
memory.
Figure 3-4 shows that when EA=0, the code/data memory is internal at 0x0000-0x1B40.
External code memory can be added from 0x0000-0xFFFF, but it appears in the memory
map only at 0x1B40-0xFFFF. Addressing external code memory at 0x0000-0x1B3F
when EA=0 causes the EZ-USB core to inhibit the #PSEN strobe. This allows program
memory to be added from 0x0000-0xFFFF without requiring decoding to disable it
between 0x0000 and 0x1B3F.
Page 3-4
3.3
Expanding EZ-USB Memory
1FFF
FFFF
1F3F
1B40
8000
2000
7B40
0000
Note 1: OK to populate data memory here--RD#, WR#, CS# and OE# pins are inactive.
Note 2: OK to populate code memory here--no PSEN# strobe is generated.
Unused Bulk Buffers
Inside EZ-USB
Registers(RD,WR)
(PSEN,RD,WR)
Code & Data
(RD,WR)
Figure 3-4. EZ-USB Memory Map with EA=0
Chapter 3. EZ-USB Memory
(RD, WR)
(RD,WR)
External
External
Memory
(Note 1)
Memory
(Note 1)
Data
Data
Outside EZ-USB
External
Memory
(Note 2)
(PSEN)
Code
EZ-USB TRM v1.9