Miniature Card

Developed by Intel.
Miniature Card is a memory-only expansion card.

Pinout

UNKNOWN CONNECTOR at the device.

UNKNOWN CONNECTOR at the card.

Pin	Name	Description	Dir
1	A18	Address Bus
2	A16	Address Bus
3	A14	Address Bus
4	Vccr	Voltage Refresh
5	CEH#	Card Enable High Byte
6	A11	Address Bus
7	A9	Address Bus
8	A8	Address Bus
9	A6	Address Bus
10	A5	Address Bus
11	A3	Address Bus
12	A2	Address Bus
13	A0	Address Bus
14	RAS#	Row Address Strobe
15	A24	Address Bus
16	A23	Address Bus
17	A22	Address Bus
18	OE#	Output Enable
19	D15	Data Bus
20	D13	Data Bus
21	D12	Data Bus
22	D10	Data Bus
23	D9	Data Bus
24	D0	Data Bus
25	D2	Data Bus
26	D4	Data Bus
27	RFU	Reserved for future use
28	D7	Data Bus
29	SDA	Serial Data and Address
30	SCL	Serial Clock
31	A19	Address Bus
32	A17	Address Bus
33	A15	Address Bus
34	A13	Address Bus
35	A12	Address Bus
36	RESET#	Reset
37	A10	Address Bus
38	VS1#	Voltage Sense 1
39	A7	Address Bus
40	BS8#	Bus Size 8
41	A4	Address Bus
42	CEL#	Card Enable Low Byte
43	A1	Address Bus
44	CASL#	Column Address Strobe Low Byte
45	CASH#	Column Address Strobe High Byte
46	CD#	Card Detect
47	A21	Address Bus
48	BUSY#	Ready/Busy
49	WE#	Write Enable
50	D14	Data Bus
51	RFU	Reserved for future use
52	D11	Data Bus
53	VS2#	Voltage Sense 2
54	D8	Data Bus
55	D1	Data Bus
56	D3	Data Bus
57	D5	Data Bus
58	D6	Data Bus
59	RFU	Reserved for future use
60	A20	Address Bus

The following three is separate:

Name	Description	Dir
GND	Ground
VCC	Power
CINS#	Card Insertion

Note: Direction is card relative device.

Technical

This section is currently based solely on the Miniature Card specification v1.1.

Signal Descriptions:

A0-A24

Address A0 to A24 are the address bus lines that can address up to 32 Mwords (64 MBytes). The Miniature Card specification does not require the Miniature Card to decode the upper address lines. A 2 Mbyte Miniature Card that does not decode the upper address lines would repeat its address space every 2 Mbytes. Address 0h would access the same physical location as 200000h, 400000h, 600000h, etc.

D0-D15

Data lines D0 through D15 constitute the data bus. The data bus is composed of two bytes, the low byte D[7:0] and the high byte D[15:8].

OE#

OE# indicates that the current bus cycle is a read cycle.

WE#

WE# indicates that the current bus cycle is a write cycle.

VS1#

Voltage Sense 1 signal. The card grounds this signal to indicate it can operate at 3.3 Volts. This signal must either be connected to card GND or left open.

VS2#

Voltage Sense 2 signal. The card grounds this signal to indicate it can operate at x.x Volts (the value to be determined at a later date). This signal must either be connected to card GND or left open.

CEL#

CEL# enables the low byte of the data bus (D[7:0]) on the card. This signal is not used in DRAM cards.

CEH#

CEH# enables the high byte of the data bus (D[15:8]) on the card. This signal is not used in DRAM cards.

RAS#

RAS# strobes in the row address for DRAM cards.

CASL#

CASL# strobes in the low byte column address for DRAM cards.

CASH#

CASH# strobes in the high byte column address for DRAM cards.

RESET#

RESET# controls card initialization. When RESET# transitions from a low state to a high state, the Miniature Card must reset to a predetermined state.

BUSY#

BUSY# is a signal generated by the card to indicate the status of operations within the Miniature Card. When BUSY# is high, the Miniature Card is ready to accept the next command from the host. When BUSY# is low, the Miniature Card is busy and unable to accept some data operations from the host. For example, in Flash Miniature Cards the BUSY# signal is tied to the components RY/BY# signal. However, ROM Miniature Cards would always drive BUSY# high since the host will always be able to read from a ROM Miniature Card.

Vccr

Vccr provides a low current (refresh) voltage supply. Vccr is a feature used by DRAM Miniature Cards to "self-refresh" during "sleep" mode.

SDA

I²C: Serial Data/Address.

SCL

I²C: Serial Clock are used to read the attribute information structure (AIS) from the serial EEPROM in a DRAM card.

CD#

CD# is a grounded interface signal. After a Miniature Card has been inserted, CD# will be forced low. The card detect signal is located in the center of the second row of interface signals, and should be one of the last interface signals to connect to the host. Do not confuse CD# with CINS#. CINS# is an early card detect that is one of the first signals to connect to the host.

BS8#

BS8# is a signal driven by the host to indicate if the data bus is x8 or x16. An 8-bit host must drive BS8# low and tie the high byte data bus D[15:8] to the low byte data bus D[7:0]. A 16-bit host must drive this signal high.

GND

Ground

Vcc

Vcc is used to supply power to the card.

CINS#

CINS# is a grounded signal on the front of the Miniature Card that can be used for early detection of a card insertion. CINS# makes contact on the host when the front of the card is inserted into the socket, before the interface signals connect.

Contributions

• Joakim Ögren

Sources

• Minicature Card v1.1 spec at Miniature Card Implementers Forum's homepage