LAN9116 datasheet(97/109 Pages) MICROCHIP

97 / 109 page

 2005-2016 Microchip Technology Inc.

DS00002268A-page 97

LAN9116

6.7

TX Data FIFO Direct PIO Writes

In this mode the upper address inputs are not decoded, and any write to the LAN9116 will write the TX Data FIFO. This

mode is enabled when FIFO_SEL is driven high during a write access. This is normally accomplished by connecting the

FIFO_SEL signal to a high-order address line. This mode is useful when the host processor must increment its address

when accessing the LAN9116. Timing is identical to a PIO write, and the FIFO_SEL signal has the same timing charac-

teristics as the address lines.

Timing for 16-bit and 32-bit cycles is identical with the exception that D[31:16] is ignored during a 16-bit write. Note that

address lines A[2:1] are still used when the LAN9116 is operating in 32-bit and 16-bit mode. Address bits A[7:3] are

ignored.

FIGURE 6-7:

TX DATA FIFO DIRECT PIO WRITE TIMING

Note:

The “Data Bus” width is 32 bits with optional support for 16-bit bus widths.

TABLE 6-7:

TX DATA FIFO DIRECT PIO WRITE TIMING

Symbol

Description

MIN

TYP

MAX

Units

tcycle

Write Cycle Time

165

tcsl

nCS, nWR Assertion Time

tcsh

nCS, nWR Deassertion Time

tasu

Address, FIFO_SEL Setup to nCS, nWR Assertion

tah

Address, FIFO_SEL Hold Time

tdsu

Data Setup to nCS, nWR Deassertion

tdh

Data Hold Time

Note:

A TX Data FIFO Direct PIO Write cycle begins when both nCS and nWR are asserted. The cycle ends

when either or both nCS and nWR are deasserted. They may be asserted and deasserted in any order.

Data Bus

nCS, nWR

FIFO_SEL

A[2:1]

LAN9116 Datasheet(PDF) 97 Page - Microchip Technology

LAN9116 Datasheet(HTML) 97 Page - Microchip Technology

Html Pages

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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL