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LAN9500AI Datasheet(PDF) 151 Page - Microchip Technology

Part # LAN9500AI
Description  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI Datasheet(HTML) 151 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 151
LAN950x
7.3.25
TRANSMIT FIFO LEVEL DEBUG REGISTER (DBG_TX_FIFO_LVL)
Address:
078h
Size:
32 bits
Bits
Description
Type
Default
31:28
RESERVED
RO
-
27:16
TX FIFO Read Level (TXRDLVL)
This is a DWORD count defined as follows:
The count is increased by the number of DWORDs contained in the packet
after the ENTIRE packet has been written into the FIFO.
As a packet is read from the FIFO, it is decremented each time a DWORD
is read.
Note:
Rewinds not supported.
RO
000h
15:12
RESERVED
RO
-
11:0
TX FIFO Write Level (TXWRLVL)
This is a DWORD count defined as follows:
As a packet is written into the FIFO, it is incremented each time a DWORD
is written.
Whenever a COMPLETE packet has been read from the FIFO, it is
decreased by the number of DWORDs contained in the packet.
On rewind, it is decreased by the number of DWORDs of the packet that has
currently been transferred into the FIFO.
Note:
Write side rewinds are supported, i.e., if a USB packet is received
with an error, the packet is rewound out and re-received from the
host.
RO
000h



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