TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 544
TX4939XBG-400
Manufacturer Part Number
TX4939XBG-400
Description
Manufacturer
Toshiba
Datasheet
1.TX4939XBG-400.pdf
(740 pages)
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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EMAC
18.4.3.4. Transmission Polling Control Register (TxPollCtl)
The Transmission Polling Control Register uses part of internal RAM, so it is not affected by hardware resets or software
resets.
The Transmission Polling Control Register controls the frequency at which packets to be transmitted are polled. The
TxPollCtl field operates as a counter. When a value is set to it, it decrements until it reaches 0. When it reaches 0, it polls
to see if preparations for the next transmission packet are complete. No polling is performed when 0 is set in the
TxPollCtl field. When the clock frequency is 33 MHz, the counter units equate to 61.44 µs. The software driver initializes
this register. The software driver also sets the count value.
Rev. 3.1 November 1, 2005
Bits
31 : 12
11 : 0
Default
Default
Name
Name
TYPE
TYPE
31
15
Mnemonic
TxPollCtl
RESERVED
30
14
29
13
Field Name
Reserved
Transmission Polling Control
Register
Figure 18-36 Transmission Polling Control Register
28
12
27
11
26
10
25
9
18-52
RESERVED
Description
TxPollCtl (Default: -, R/W)
The Transmission Polling Control Register controls the frequency
at which packets to be transmitted are polled.
24
8
23
7
22
6
TxPollCtl
R/W
-
21
0x0C
5
20
4
Toshiba RISC Processor
19
3
18
2
17
1
TX4939
16
0
18
18
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