TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 551

• 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
18.4.4. Flow Control Register group
Pause Count Register (PauseCnt)
Remote Pause Count Register (RemPauCnt)
Software resets initialize the Pause Count Register and Remote Pause Count Register to 0x0000_0000.
The Pause Count Register displays the current value of the received Pause count. When a Pause operation MAC control
frame is received, the specified Pause count is set and the count is decremented at each unit time stamp.
When the count is "0", it indicates that MAC is not pausing. The Remote Pause Count Register displays a rough value of
the pause counter that the remote station has based on the transmitted Pause command.
In either case, the unit is 1 slot time. In other words, it is 512-bit late time.
Rev. 3.1 November 1, 2005
Bits
31 : 16
15 : 0
Bits
31 : 16
15 : 0
Default
Default
Default
Default
Name
Name
Name
Name
TYPE
TYPE
TYPE
TYPE
31
15
31
15
Mnemonic
PauseCnt
Mnemonic
RemPauCnt
30
14
30
14
29
13
29
13
Field Name
Reserved
Reception Pause Count
Field Name
Reserved
Remote Pause Count
28
12
28
12
Figure 18-44 Remote Pause Count Register
27
11
27
11
Figure 18-43 Pause Count Register
0x30
26
10
26
10
25
25
9
9
18-59
0x34
RESERVED
RESERVED
RemPauCnt
Description
PauseCnt (Default: 0, R)
This is the number of time slots that the transmitter pauses as a
result of receiving a MAC control Pause operation packet.
Description
RemPauCnt (Default: 0, R)
This is the number of time slots that the remote MAC pauses as a
result of transmitting a Pause operation packet.
24
24
PauseCnt
8
8
0x0000
0x0000
R
R
23
23
7
7
22
22
6
6
21
21
5
5
20
20
4
4
Toshiba RISC Processor
19
19
3
3
18
18
2
2
17
17
1
1
TX4939
16
16
0
0
18
18