TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 107

• Manufacturer Part Number: TX4939XBG-400
• Manufacturer: Toshiba

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

CG
5.5. SSCG (Spread Spectrum Clock Generator)
5.5.1. SSCG UNIT
The SSCG UNIT in TX4939 modulates MSTCLK directly. This SSCG module does frequency modulation by pure digital
circuit.
5.5.2. Modulation Profile
Rev. 3.1 November 1, 2005
Modulation Magnitude = 0.5% (p-p)
Modulation Frequency = 31.25 KHz
Maximum Delay Time = 516 steps (19.09 nS)
MSTCLK
20MHz
CKIN
SSCGEN
SSCG
Figure 5-8 Location of SSCG UNIT
CKOUT
5-13
FN
BP
X 20
PLL#1
PLL#1
400 MHz
ND[4:0]
FS[0]
CN
CK
Toshiba RISC Processor
TX4939
5
5
5
5