TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 260

• 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

Video Port
Example:
Memoy has the following byte data:
byte # - 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
data
byte # - 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
data
With validCount[11:0] = 10(11 bytes), Offset[11:0] = 4 (5 bytes) and Bcount[22:0] = 32(33 bytes) data send out by VPC will
have the following pattern assuming dma address(DMAGA[31:0] = 0) is pointing to byte 0:
a b c d e f g h i j
Bytes #10 to #15 and #27 to #31 are skipped because of the Offset[11:0] = 4.
In this example, Bcount[22:0] can be up to
8 Mbyte - (8Mbyte % 11) - 1 = 8388599 (0x7FFFF7)
MPEG Transmit
If VPC is programmed to transmit packet in MPEG format with Vddata = 187(188 byte data packet) and Bcount[22:0]
greater than 187(more than 188 bytes), the number of packets will be sent by VPC is
((Bcount + 1)
For example, if vdfor = 1, Vddata = 187 and bcount = 189 (190 bytes), 2 packets will be sent out by VPC. Second packet
will have 0s after 2 bytes of valid data:
packet #0
packet #1
Rev. 3.1 November 1, 2005
- a b c d e f g h i j
-
D
D188
E
D0
0
/ (Vddata + 1)) + ((((Bcount + 1) % (Vddata + 1)) != 0) ? 1 : 0)
F
D189
G
D1
1
k q r s t u v w x y z A G
H
D2
I
2
0
J
D3
k
3
0
K
l
L
D4 …
4 …
0 …
m
M
n
N
D187
187
12-8
o
O
0
p
P
q
H
Q
r
I
R
s
J
S
t
K
T
u
L
U
v
M
V
Toshiba RISC Processor
w
N
W
x
O
y
P
z
Q
A
B
TX4939
C
12
12