SL11R Cypress Semiconductor Corp, SL11R Datasheet - Page 29

• Manufacturer Part Number: SL11R
• Description: IC MCU FULL SPD USB 16B 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of SL11R

• Applications: USB Microcontroller
• Core Processor: RISC
• Program Memory Type: Mask ROM (6 kB)
• Controller Series: USB Controller
• Ram Size: 3Kx8
• Interface: 2-Wire Serial, UART, USB
• Number Of I /o: 32
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 65°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1462

The current SL11R BIOS only support up to a 2Kbyte serial EEPROM. To read and write to a device that is larger than 2Kbytes,
the SL11R-BIOS requires additional serial EEPROM to be connected as shown in Figure 4-5.
In this example, the SL11R BIOS will first access the (small) program residing on IC1 serial EEPROM, and then it will access the
second IC2 EEPROM (see [Ref. 1] SL11R_BIOS for more information).
4.14
The SL11R has a multiplexed address port and 16-bit data port. These interface signals are provided to interface to an external
SRAM, ROM or DRAM. The DRAM port provides RAS, CAS, RD and WR control signals for data access and refresh cycles to
the DRAM. At boot up stage, the SL11R BIOS configures the SL11R for external SRAM and serial EEPROM. In addition, the
external memory interface is set up as 16-bit and 7 wait states for both external SRAM and EEPROM. The DRAM controller needs
to be set up by the user.
Example 2 SL11R extended memory setup:
Document #: 38-08006 Rev. **
• Pin 1 (A0), Pin 2 (A1), Pin 3 (A2), Pin 4 (GND) and Pin 7 Write Protect) are connected to Ground.
internal_rom_start:
External SRAM, EPROM, DRAM
mov
cmp
je
mov
mov
mov
cmp
je
cmp
jne
or
[0xC03A],0x0077
[0xC100],0xCB36 ;check for special pattern in external ROM
0xC102
[0xC006],0x10
[0xC008],1
[0xC03E],3
[0xC100],0xC3B6 ;external ROM has 0xC3B6 as first 16 bits
xrom_ok
b[0xC100],0xB6
xrom_ok
[0xC03A],0x80
Figure 4-4. 2-Wire Serial Interface 2K-byte Connection
Figure 4-5. 2-Wire Serial Interface 16K Connection
;set 16-bit ROM & 7 wait
;if it’s there, jump to it
;2/3 clock
;at 24 MHz
;extra wait state for ROM and Debug
;check 0xc3b6 for 8-bit ROM
;set for 8-bit ROM
1
2
3
4
1
2
3
4
EEPROM
EEPROM
A0
A1
A2
GND
A0
A1
A2
GND
AT24C16
AT24C128
VCC
VCC
SDA
SDA
SCL
SCL
WP
WP
8
7
6
5
8
7
6
5
GPIO31
GPIO30
GPIO30
GPIO31
5K
5K
VCC
VCC
0.1uF
0.1uF
Page 29 of 85
SL11R