TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 247

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TX4939XBG-400

Manufacturer Part Number
TX4939XBG-400
Description
Manufacturer
Toshiba
Datasheet

Specifications of TX4939XBG-400

Cpu Core
TX49/H4 90nm
Clock Mhz/max Mips
400/520
Inst./data Cache
32KB (4 Way)/32KB (4 Way)
Tlb
x
1cycle Mac
x
Volts (v)
1.25/2.5/3.3
Peripherals
DDR, NAND, ATA, ETHERNET, SECURITY, FPU, MMU, SPI, I2S, I2C, PCI, VIDEO, UART, TIMER, RTC
Companion Chip
TC86C001FG
Package
PGBA456

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RTC
11.3.
11.3.1.
RTC has 6 Bytes length time count register, 4 bytes length alarm register, 6 bytes length read/write buffer register, and 250
bytes universal registers.
Rev. 3.1 November 1, 2005
Name
RTC
ALARM
Name
RWB
RAM
RTC IP Registers
RTC IP Internal Registers
Structure
RTC [47:0]
ALARM [47:16]
Structure
RWB [47:0]
RAM [6:255] [7:0]
Byte
6
4
Byte
6
250
Table 11-1 Non-Exposed Internal Registers
Table 11-2 Exposed Internal Registers
Description
RTC [47:0] is a 48-bits length register that counts two on every clock edge of 32.768
KHz oscillator clock. Therefore, the value of RTC [47:0] register is considered as
fixed-point-representation.
Such as RTC [47:16] is corresponds to the time count of second, starting from January
1
The contents of ALARM [47:16] will be compared with RTC [47:16] on every 32.768
KHz clock edge. Once the value is matched, alarm signal will be asserted. This alarm
signal keep asserted until new value is set in the ALARM register.
Description
RWB [47:0] is a 48-bits register corresponds to the RTC register and ALARM register.
The contents of ALARM [47:16] register will correspond to RWB [47:16] when the data
exchange happens.
These registers are the entity of Non-Volatile CMOS memories.
st
of 1970. RTC [15:0] is the decimal place of second.
11-3
Toshiba RISC Processor
TX4939
11
11

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