TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 544

• 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

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