Baryon

Baryon is the codename for the PSP Syscon (System Controller) chip. Communication with this chip is done through SPI.

Versions

Version	Notes
0x00020601	First known version. Found on TMU-001 motherboard.
0x00030600
0x00040600
0x00114000
0x00121000
0x0022B200
0x00234000	Removed ability to write to battery EEPROM.
0x00243000
0x00263100
0x00285000
?0x002A0000?	From hypothetical TA-094 motherboard.
0x002C4000
0x002E4000
0x00304000
0x00403000

Hardware

Hardware versions

• Note: You can usually deduce the serial number of the system controller chip on the motherboard when knowing Baryon version. For example, 0x00030600 has the BAR14 labelled chip, while 0x00040600 has the BAR15 labelled chip.

Hardware Signature (3AXX)

02 13 10 7f 04 7c 7f 7f 02 c4 37 38 46 b0 b5 b3 34 20 20 79 03 5d 03

Meaning

10 Vendor (Renessas)
7F Extension code (fixed in 78K0/Kx2)
04 Function information (fixed in 78K0/Kx2)
7C Device Extension code (fixed in 78K0/Kx2)
7F 7F 02 Internal flash memory last address (extracted from the lower bytes)  (0xBFFF) (48KB) (Note 2)
C4 37 38 46 B0 B5 B3 34 20 20 Device name (D78F0534  )
79 Security flag information (odd parity bit so 0xF9) (Note 3)
03 Boot block number (fixed)

Notes

Note 2.
The parity calculation for the END field is performed as follows (when the last address is 005FFFH) 
 
<1> The END field is divided in 7-bit units from the lower digit (the higher 3 bits are discarded). 
 
    0  0     5 F     F F 00000000 01011111 11111111  ↓  000  0000001  0111111  1111111 
 
<2> The odd parity bit is appended to the highest bit. 
 
    p0000001  p01111111  p1111111 (p = odd parity bit)  = 0000001  10111111  01111111  = 01 BF 7F 
 
<3> The order of the higher, middle, and lower bytes is reversed, as follows.    7F BF 01 
 
CHAPTER  5   DESCRIPTION  OF  COMMAND  PROCESSING 
Application Note  U17739EJ2V0AN 50 
  The following shows the procedure to translate the values in the END field that has been sent from the microcontroller to the actual address. 
 
<1> The order of the higher, middle, and lower bytes is reversed, as follows. 
 
 7F BF 01       ↓  01 BF 7F 
 
<2> Checks that the number of “1” is odd in each byte (this can be performed at another timing). 
 
<3> The parity bit is removed and a 3-bit 0 is added to the highest bit. 
 
 01 BF 7F       ↓  00000001  10111111  01111111       ↓  0000001    0111111  1111111       ↓  000  0000001  0111111  1111111 
 
<4> The values are translated into groups in 8-bit units. 
 
 00000000101111111111111       ↓  00000000  01011111  11111111       ↓  =     0     0       5     F       F     F 
 
  If “7F BF 01” is given to the END field, the actual last address is consequently 005FFFH. 

Note 3. When security flag information is set using the Security Set command, the highest bit is fixed to “1”.  If the security flag information is read using the Silicon Signature command, however, the highest bit is the odd parity. 

Hardware Revision (3AXX)

D78F0534

• custom BGA 78K0/KE2
• 48 KB FLASH
• 1KB RAM
• 4 MHz
• Multiplier x1
• UART-X1-OSC
• If 64 Pin, REGC Connected to VDD (for some odd reason)

Pictures

<imgur w="500">32tdUCq.png</imgur>