CY3684 Cypress Semiconductor Corp, CY3684 Datasheet - Page 17

• Manufacturer Part Number: CY3684
• Description: KIT DEVELOPMENT EZ-USB FX2LP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB FXr
• Type: MCUr

Specifications of CY3684

• Contents: 2 Boards, Cables, CD
• Silicon Manufacturer: Cypress
• Application Sub Type: USB
• Kit Application Type: Interface
• Silicon Core Number: CY7C68013A-128AXC
• Features: FX2LP Development Kit
• Silicon Family Name: EZ-USB FX2LP
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CY7C68013A-128AC, CY7C64713-128AC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1677; CY3684; Q2204408

4.7 U2 -- 22v10 GAL
A standard 22v10 GAL provides general purpose “glue logic” on the board. It provides the AND
gate required to combine the PSEN and READ signals, adds memory map support, debug LEDs
and provides three spare outputs for customer defined functions.
4.8 Memory Maps
The factory default is to have both MM1 and MM0 jumpers removed. This setting should be used
for all development work using the Keil software tools.
–
–
EZ-USB Development Board
Figure 1-1. The four EZ-USB Dev Board memory maps. The GAL sets EA=1 for the Ext Flash
Kilobytes of external RAM. The 8051 begins execution from internal RAM (the GAL sets
EA=0). Note that even though there is an apparent overlap between the internal 16 Kilobytes
and bottom 16 Kilobytes of the external RAM, EZ-USB disables RAM strobes for the bottom
16 Kilobytes, so there is no conflict. This EZ-USB decoding allows a standard 64 Kilobyte
RAM to be used without requiring external decoding to inhibit access to the bottom 16 Kilo-
bytes.
bytes. This configuration is useful for systems that add external devices that require memory-
mapped access. As with the default configuration, the 8051 begins execution from internal
RAM (the GAL sets EA=0).
The default configuration provides 16 Kilobytes of on-chip code and data memory, plus 48
The second column, “24K gap”, enables the external RAM only for access to its upper 32 Kilo-
jumpers
0xFFFF
0x2000
0x0000
on-chip
Factory Default
Internal
RAM
C&D
16K
MM1: out
MM0: out
configuration only, enabling external code memory.
off-chip
Used
Code
RAM
Data
Not
64K
Ext
&
on-chip
Internal
RAM
C&D
16K
MM1: in
MM0: out
24K gap
off-chip
Code
RAM
Data
32K
Ext
&
on-chip
Internal
RAM
C&D
16K
MM1: out
MM0: in
Ext Flash
off-chip
Code
RAM
64K
Ext
on-chip
Internal
RAM
C&D
16K
Single Chip
MM1: in
MM0: in
off-chip
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